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# OCR MEI M1 (Mechanics) 17th June Watch

1. Do people agree with these answers to Q4?

4. a=(0, -8). u= (2, 6).
t=2 speed=10.19ms^-1.
y=3x-x^2 proven.
2. (Original post by Connorbwfc)
Do people agree with these answers to Q4?

4. a=(0, -8). u= (2, 6).
t=2 speed=10.19ms^-1.
y=3x-x^2 proven.
wasnt u (2 6) - (0 8)t
3. (Original post by Synmatic)
wasnt u (2 6) - (0 8)t
Yes and initially t=0, so it is (2, 6) I think.

4. I got the angle of 30 too but i struggles with the first parts of the question, i think my equations were: 4*9.8-T=4a and 4*9.8+T=8a and then got a as 12. something

Overall I didn't like this exam especially the beginning of section A and the end of section B
i think mine were t=8a and -t+4g=4a

Same here

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5. (Original post by Connorbwfc)
Yes and initially t=0, so it is (2, 6) I think.
ah you're right dammit
6. (Original post by Synmatic)
ah you're right dammit
Did it ask for the initial velocity?

If so I think I am correct, but I'm not too sure now haha.
7. (Original post by Connorbwfc)
Did it ask for the initial velocity?

If so I think I am correct, but I'm not too sure now haha.
They should've specified initial velocity instead of 'u'
8. You are correct u is (2 6)
9. Do people agree with these similarities and differences?

For A and B
Same: Constant acceleration of 10 for first 5 seconds.
Different: for 5-8 seconds A=accelerating, B=constant speed.

For B and C
Same: Both have a constant speed for 5-8 seconds. Both accelerating from 0-5 seconds.
Different: Different constant speed for 5-8 seconds -25 vs 50.
10. For the second to last questio of 7, i worked out the angles to workou t sinalpha and beta so i ended up getting an acceleration of -5×10^-4 instead of 0. Will i lose many marks??
11. (Original post by prepdream)
For the pigeon question, I set like 4=ut+1/2at^2, tried to solve it and said that there is no real root for the equation so it cant reach the pigeon? How do you guys solve this one?
I solved it by finding the maximum vertical displacement of the stone, i.e. where vertical velocity = 0. This was under 4m, so the stone could not have hit the pigeon. Your method sounds fine too, though
12. How many marks is question 4 if anyone can remember?
Bloody forgot to put t=0 for u oh well
13. did anybody else forget to divide the 7500N but 9.8 to find the mass in the 7th question part ii.
14. (Original post by prepdream)
How many marks is question 4 if anyone can remember?
Bloody forgot to put t=0 for u oh well
the full question was 8 marks
15. (Original post by Connorbwfc)
Do people agree with these similarities and differences?

For A and B
Same: Constant acceleration of 5 for first 5 seconds.
Different: for 5-8 seconds A=accelerating, B=constant speed.

For B and C
Same: Both have a constant speed for 5-8 seconds. Both accelerating from 0-5 seconds.
Different: Different constant speed for 5-8 seconds -25 vs 50.
I answered exactly the same as you for B and C!

My answer for A and B was different, though, but I'm fairly sure I got that one wrong. Something about not taking mass into account for similarity (which on hindsight was probably completely irrelevant ) and for the difference I put that initial acceleration for A was 5 whereas it was 10 for B
16. I can't believe I messed up the last question so bad when working out acceleration. I forgot that alpha and beta change and used my values of sin alpha and sin beta from an earlier part. Would I get any marks?
17. (Original post by zabveniye)
I answered exactly the same as you for B and C!My answer for A and B was different, though, but I'm fairly sure I got that one wrong. Something about not taking mass into account for similarity (which on hindsight was probably completely irrelevant ) and for the difference I put that initial acceleration for A was 5 whereas it was 10 for B
I put that d=5T^2 for the first five seconds for both. In my original post it was meant to say 10 instead of 5 btw in the similarities for A and B.
18. (Original post by ♥Samantha♥)
I can't believe I messed up the last question so bad when working out acceleration. I forgot that alpha and beta change and used my values of sin alpha and sin beta from an earlier part. Would I get any marks?
I did this too. Did you get a value of 4.01 for a?

I think we will probably get 2/4 marks. What do you reckon?
19. What does everyone think the grade boundaries will be?
20. What a **** show that was

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