I messed up the 2D motion one and got the first bit wrong by a wrong calculation although the rest of the wuestion had the correct working but wrong figures?im guessing no error carried forward? :frown:

Also any ideas of grade boundaries?
I found it very hard hope everyone ends up doing really well!

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Reply 504

*mike

Original post by FLLF

I did the same, ended up just crossing everything out and putting 20... There didnt seem to be a logical method

at least you got the marks, I didnt even realise it was 20!

Reply 505

KaranS95

Harder then usual papers but still managed 95ums.. 1 silly mistake but oh well..

Reply 506

FLLF

For that horrible centre of mass q, after 30 mins I got the distance as 1/2m and the angle at 10.9 (from memory)... Can anyone confirm these?

Reply 507

mmss

i think for the distance one you were meant to integrate the velocity between the values of t=0 and 4, the answer was like 208/3???

Reply 508

FLLF

Original post by RYRK

yeahhhhhhhh, and did you add the velocities for the last part of question 7.

and what did u get for the angle of the lamina ??

10.9 after some cosine rule trickery

Reply 509

JackH12

Original post by *mike

Love how writing 20ms-1 for 3b got you 5 marks, I did all the differentiating and stuff to get 4.5 which is totally wrong :frown:

I thought 4.5 is right as if you sketched the graph that was actually the the highest speed.

Reply 510

Student8

Original post by *mike

Love how writing 20ms-1 for 3b got you 5 marks, I did all the differentiating and stuff to get 4.5 which is totally wrong :frown:

what i did that as well - how can a five mark question result in the answer 20!

Reply 511

KaranS95

Original post by FLLF

For that horrible centre of mass q, after 30 mins I got the distance as 1/2m and the angle at 10.9 (from memory)... Can anyone confirm these?

yes mate your absolutely spot on

Reply 512

FLLF

Original post by mmss

i think for the distance one you were meant to integrate the velocity between the values of t=0 and 4, the answer was like 208/3???

Did the same at first, you had to integrate from t=0 to 2, then from t=2 to 4, because it changed direction... Came out at 24

Reply 513

thomashowarth

ImageUploadedByStudent Room1370560526.364499.jpg

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Reply 514

Student8

Original post by FLLF

For that horrible centre of mass q, after 30 mins I got the distance as 1/2m and the angle at 10.9 (from memory)... Can anyone confirm these?

i got 0.5 as well but i got a different angle

Reply 515

FLLF

Wtf was 7c on about? I just ended up restating the velocity of the 3rd particle

Reply 516

FLLF

Original post by Student8

i got 0.5 as well but i got a different angle

I'm only going from memory, the angle was definatley about 10 degrees, well, at least that's what I got

Reply 517

Student8

when do you think arsey will put the mark scheme up ?

Reply 518

*mike

Original post by Student8

what i did that as well - how can a five mark question result in the answer 20!

Original post by JackH12

I thought 4.5 is right as if you sketched the graph that was actually the the highest speed.

Ask edexcel but tbh I am really unhappy that you could get 5 marks just by looking at the equation :frown:

@Jack I thought the same as you, I didnt even think to just look at the equation and sub in 0.

I lost marks on this question, the angle question and the question right at the very end, 14 marks lost, and to think I wanted 100 UMS lol