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# How did you do in M2?! watch

1. (Original post by hajira)
haha thanx

i was refering to my mistake that got burried in the posts lol..
how many marks was the CoM question?
OH sorry! I didnt do M2, I done S2 on wednesday.

In fact, why am I even in here

2. 8 marks in total I think... 5 marks for part a) and 3 marks for part b)
3. (Original post by Eddie K)
8 marks in total I think... 5 marks for part a) and 3 marks for part b)
i think thats right
4. 5 maybe... loose all the A1 marks.
5. (Original post by hajira)
yup, it was like that.
stupidly enough i made a arithmetic mistake that i realized just as time ended, n got an answer of 2 2/3
i feel so bad about that cuz i KNEW i had it written wrong but cudnt change it
o well..the rest of it was all good..that question was easy as well -- i just dont kno how many marks i'd lose for that!
do u think it will just b the answer marks n not the method marks? cuz i used the wrong value for part b as well getting a wrong k
anyway, im attaching the working!
what does everyone think the boundary will be? o n how many marks was the COM question in total?

I cant remember exactly what it was out of. I think it could have been 4 or 5 for part a and 3 for part b. I would think you'd lose at worst 3 marks (1 for each wrong answer and 1 for the mistake) but you might still get full marks for part b and just lose 1 or 2 for part a.

I don't know about the boundary, it was a resit for me so I can't really compare it very well with past papers.
6. (Original post by chats)
OH sorry! I didnt do M2, I done S2 on wednesday.

In fact, why am I even in here

LoL chats..... y am i not suprised?
7. For the energy question (was it last?), was there a loss of PE and a gain in KE?
8. (Original post by sequence123)
Yup 2/7u is correct, which is smaller than 2/3u, therefore no collision
Ah yer thanks. Well I got that one wrong then (well I got it right when i re did it after the exam :-/ - if only I hadn't wasted time by not reading question for CofM and doing it as lamin first and having to redo it then I may have been able to redo this correctly, oh well nm). I hope I get some method marks anyway haha. Still, hope I haven't done too badly.

Is my Thrust question stuff right: http://www.thestudentroom.co.uk/show...=1#post2429504
?

Cheers, Daniel
9. (Original post by Syncman)
LoL chats..... y am i not suprised?
I came to see how my fellow TSR'ians got on.

Doesnt look good =(
10. (Original post by Syncman)
5 maybe... loose all the A1 marks.
cheers
i hope they noticed what i did wrong so they can give follow through marks...
i would guess 4minimum, 6maximum for me
11. yeah there was.
12. (Original post by Daniel K)
Ah yer thanks. Well I got that one wrong then (well I got it right when i re did it after the exam :-/ - if only I hadn't wasted time by not reading question for CofM and doing it as lamin first and having to redo it then I may have been able to redo this correctly, oh well nm). I hope I get some method marks anyway haha. Still, hope I haven't done too badly.

Is my Thrust question stuff right: http://www.thestudentroom.co.uk/show...=1#post2429504
?

Cheers, Daniel
yes i believe your thrust is correct
thrust was 60g x √3 = 1018N
13. (Original post by Zuber)
yes i believe your thrust is correct
thrust was 60g x √3 = 1018N
yes it was
14. (Original post by davedave)
I cant remember exactly what it was out of. I think it could have been 4 or 5 for part a and 3 for part b. I would think you'd lose at worst 3 marks (1 for each wrong answer and 1 for the mistake) but you might still get full marks for part b and just lose 1 or 2 for part a.

I don't know about the boundary, it was a resit for me so I can't really compare it very well with past papers.

hmm i shudnt worry too much then..everything else seems ok *fingers crossed*
15. What did you get on Q7c zubar? Seen quite a few different answers posted and mine was different to them all I think I think I got something around 8.70.
16. davedave, what was the question again? I might remember then.
17. (Original post by davedave)
What did you get on Q7c zubar? Seen quite a few different answers posted and mine was different to them all I think I think I got something around 8.70.
last question on the paper right?
it was √29 = 5.39 (3sf)
i think thats right (as both my SUVAT and work-energy methods came to this same conclusion)
18. got thrust rite...waheeeyyy...shame bout rest of it
19. Was that not D Zuber?
20. Methods to 7c)
initial KE gain (when initial speed is 0) : 0.5x3x5²=37.5J
so if initial speed is now 2,
KE gain is still 37.5J
0.5x3x(v²-2²)=37.5
v²=29
v=5.39

SUVAT method:
a=25/16=1.5625
u=2
s=8
v=?

v²=u²+2as
v²=4+2(25/16)(8)
v²=29
v=5.39

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