Mechanics 2 Impulse Watch

James.R
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This shouldn't be that hard, but just looking for someone to confirm whether I'm doing it correctly or not.

Three particles, A, B and C, each of mass m, lie in the same straight line. A is projected towards B with speed 3u. After the collision between A and B, B subsequently strikes C, after which all three particles have the same velocity. Calculate in terms of m and u the magnitude of the impulses in the collisions between

(a) A and B
(b) B and C

Thanks a lot

James
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latentcorpse
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a) let impulse=I

I=p2-p1 i.e change in momentum where p=mv
I= (mv+mv1)-(mu+0)
=m(v+v1-u)

b)I=p2-p1
I=(2mv)-(mv1+0)
=2mv-mv1

where v1 is the intermediate velocity of B after being struck by A and before striking C

hopefully!!!
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latentcorpse
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b) simplifies to m(2v-v1)
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