Kristina Rollová Posted May 12, 2016 Report Share Posted May 12, 2016 Hey guys, how did you feel about the Maths SL paper 2? I think that both papers went really well but lets discuss some of the questions. Reply Link to post Share on other sites More sharing options...
AnjaDe Posted May 12, 2016 Report Share Posted May 12, 2016 They were both as expected from past papers, but I honestly don't remember a single question, except the one with the normal distribution from section A.. Anyone remembers section B? 1 Reply Link to post Share on other sites More sharing options...
inriya Posted May 12, 2016 Report Share Posted May 12, 2016 I am honestly so satisfied with Math overall in both papers. I do not remember any question because I think it was very easy comparing with past papers, the one question that got me was like normal distribution too haha Been pretty bad at proability. Can someone remind me the brief outline of questions? Chemistry has been really filling up most of my memory. Reply Link to post Share on other sites More sharing options...
Kristina Rollová Posted May 12, 2016 Author Report Share Posted May 12, 2016 25 minutes ago, AnjaDe said: They were both as expected from past papers, but I honestly don't remember a single question, except the one with the normal distribution from section A.. Anyone remembers section B? 25 minutes ago, AnjaDe said: They were both as expected from past papers, but I honestly don't remember a single question, except the one with the normal distribution from section A.. Anyone remembers section B? So from section B one question was on vectors and it mostly had to do with magnitudes and finding points on the lines. Q10 had the 2 graphs and I think it was something with the area under curve and the relationship between this and a triangle formed by the tangent line. (also forgot most of the questions) In section A there was something on normal distribution (running or something) and a binomial theorem question. Reply Link to post Share on other sites More sharing options...
kevG Posted May 12, 2016 Report Share Posted May 12, 2016 There was also a question about a car and the year this girl will sell it... I don't remember the question but I do know that the year it will be sold is 2019 Reply Link to post Share on other sites More sharing options...
Apple Posted May 12, 2016 Report Share Posted May 12, 2016 What did you guys get for the Section A question asking for the possible values of p? It was the last question on that section where you were given the velocity equation that you had to integrate. Reply Link to post Share on other sites More sharing options...
Kristina Rollová Posted May 12, 2016 Author Report Share Posted May 12, 2016 2 minutes ago, Apple said: What did you guys get for the Section A question asking for the possible values of p? It was the last question on that section where you were given the velocity equation that you had to integrate. I got -0.2.. or something and 2. something As seconds can't be negative I only went with the 2. something but the graph boundaries for velocity showed that p≤ 2 so I was a bit confused and just hoped that it didn't matter. Everyone who I asked got the same. Reply Link to post Share on other sites More sharing options...
kevG Posted May 12, 2016 Report Share Posted May 12, 2016 (edited) 6 minutes ago, Kristina Rollová said: I got -0.2.. or something and 2. something As seconds can't be negative I only went with the 2. something but the graph boundaries for velocity showed that p≤ 2 so I was a bit confused and just hoped that it didn't matter. Everyone who I asked got the same. The answer is actually something like 0.8 and 1.4... the equation for velocity was given as 6t - 6, this means that when t = 0, then we have a negative velocity (it's going backwards), you will see this when you graph the function and find the area. You will notice that v is 0 at x = 1, until that point the object has traveled -3 meters. So you needed to sub in and find in the distance from 1 - p, and not 0 - p. That's what I did and some of my friends in my grade got the same answer too. It also makes sense cause they asked for the "values" of p between 0 and 2 Edited May 12, 2016 by kevG Reply Link to post Share on other sites More sharing options...
TI-84 Plus Posted May 12, 2016 Report Share Posted May 12, 2016 (edited) 26 minutes ago, Kristina Rollová said: I got -0.2.. or something and 2. something As seconds can't be negative I only went with the 2. something but the graph boundaries for velocity showed that p≤ 2 so I was a bit confused and just hoped that it didn't matter. Everyone who I asked got the same. I actually got the same as you for this question. I was also very confused, due to the graph boundaries. But nice to hear that your classmates got this result as well Edited May 12, 2016 by TI-84 Plus Reply Link to post Share on other sites More sharing options...
Apple Posted May 12, 2016 Report Share Posted May 12, 2016 32 minutes ago, Kristina Rollová said: I got -0.2.. or something and 2. something As seconds can't be negative I only went with the 2. something but the graph boundaries for velocity showed that p≤ 2 so I was a bit confused and just hoped that it didn't matter. Everyone who I asked got the same. I got the exact same answers! So in the end what I did was to write 0<p≤ 2.something as my final answer... Not really sure what else to do. Reply Link to post Share on other sites More sharing options...
simon9867 Posted May 12, 2016 Report Share Posted May 12, 2016 But how did u calculated it? I didn't know how to calculate the constant Reply Link to post Share on other sites More sharing options...
kyriakosr21 Posted May 12, 2016 Report Share Posted May 12, 2016 In both papers section A last 2 questions were very hard... Overall a manageable paper, but i think 2015's were far easier than these Reply Link to post Share on other sites More sharing options...
AnjaDe Posted May 12, 2016 Report Share Posted May 12, 2016 Did you calculate that p constant question as an integral of velocity or integral of absolute velocity, because I wasn't sure if the question stated implied for total distance traveled or displacement? Reply Link to post Share on other sites More sharing options...
Kristina Rollová Posted May 12, 2016 Author Report Share Posted May 12, 2016 2 minutes ago, AnjaDe said: Did you calculate that p constant question as an integral of velocity or integral of absolute velocity, because I wasn't sure if the question stated implied for total distance traveled or displacement? I did it as an integral from 0 to p and made it equal to 2. This than gives an equation and you subtract 2 from both sides to get a quadrtic or something which you put in the calc and solve for zeros. Reply Link to post Share on other sites More sharing options...
AnjaDe Posted May 12, 2016 Report Share Posted May 12, 2016 6 minutes ago, Kristina Rollová said: I did it as an integral from 0 to p and made it equal to 2. This than gives an equation and you subtract 2 from both sides to get a quadrtic or something which you put in the calc and solve for zeros. Oh ok, I did the same thing, but I thought that maybe because question says possible values of p, and we got a negative value, that that should have been actually the integral of the absolute value of velocity to get distance and not displacement, which I wouldn't know how to do... Reply Link to post Share on other sites More sharing options...
ibstudent77 Posted May 12, 2016 Report Share Posted May 12, 2016 Did anyone get 2 sets of coordinates for the last vector question? I got quadratic equations for the values of x y z and so got 2 values for each. For the gradient question did anyone get -1.06? Reply Link to post Share on other sites More sharing options...
simon9867 Posted May 12, 2016 Report Share Posted May 12, 2016 51 minutes ago, Kristina Rollová said: I did it as an integral from 0 to p and made it equal to 2. This than gives an equation and you subtract 2 from both sides to get a quadrtic or something which you put in the calc and solve for zeros. I also thought in doing it in that way at the beginning, but then realized that the question was worth seven marks and when integrating there must be a constant (but maybe u have it correct) Reply Link to post Share on other sites More sharing options...
Kristina Rollová Posted May 12, 2016 Author Report Share Posted May 12, 2016 14 minutes ago, ibstudent77 said: Did anyone get 2 sets of coordinates for the last vector question? I got quadratic equations for the values of x y z and so got 2 values for each. For the gradient question did anyone get -1.06? When you do area under the curve the constant isn't included. Reply Link to post Share on other sites More sharing options...
Kristina Rollová Posted May 12, 2016 Author Report Share Posted May 12, 2016 49 minutes ago, AnjaDe said: Oh ok, I did the same thing, but I thought that maybe because question says possible values of p, and we got a negative value, that that should have been actually the integral of the absolute value of velocity to get distance and not displacement, which I wouldn't know how to do... that makes sense So maybe the answer was the -0.2... but actually as an absolute value which means that p= 0.2... (I dont really remember the exact value but it was something similar) Reply Link to post Share on other sites More sharing options...
ibstudent77 Posted May 12, 2016 Report Share Posted May 12, 2016 31 minutes ago, Kristina Rollová said: When you do area under the curve the constant isn't included. Area under the curve? Im talking abt the magnitude question the very last one Reply Link to post Share on other sites More sharing options...
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