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Q.

A big ball of mass M, moving with velocity u strikes a small ball of mass m, which is at rest. Finally small ball attains velocity u and big ball v. What is the value of v :

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a

M-mMu

b

mM+mu

c

2mM+mv

d

MM+mv

answer is A.

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Mu=mu+Mv⇒v=M-muM

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