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Ball A travelling with velocity "v", collides head-on with stationary ball B

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Ball A travelling with velocity "v", collides head-on with stationary ball B. If the mass of ball A is much smaller than the mass of ball B, what is the velocity of ball B immediately after impact?

a) v, the same as the inital velocity of A

b) 2v, twice the initial velocity of A

c) 0v (remains stationary)

d) 0.5v (half the initial velocity of a)