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# M2 watch

1. im having trouble with exercise 4D question 7 on page 119 of the heinmann M2 for edexcel book.
any help would be appreciated

two particles A and B of mass 4kg and 5kg respectively on smooth horizontal surface lie at rest.
A is projected with speed u and collides with B.
following this collision B strikes a smooth vertical wall normaly.
After rebounding from the wall B hits A.
B is brought to rest by this collision.

(a)show that 2e³-3e²-3e +2 =0
where e is the co efficent of restitution between the two balls and B and the wall

(b)verify that e=1/2
2. Could you write out the question please as some of us are on other exam boards but we may still be able to help you
3. Ah yes. I remember this. Took me a while. It takes up at least two pages and I really can't be bothered to type it out again. This won't come up in the exam.

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