Question

a ball A of mass 2 kg travelling at 2 m/s has a head collision with an identical ball b at rest . A stops and b moves off. find the velocity of b after collision
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Answer 1

Answer:

velocity of ball b would be 2m/s

Explanation:

we have,. ball A. ball B

mass. m. kg m. kg

initial

velocity 2m/s. 0m/s (at rest)

final

velocity. 0m/s (given). ?

according to the conservation of momentum ,

m1u1+m2u2=m1v1+m2v2

or, m×2+m×0=m×0+m×v2

or, 2m =mv2

or, v2=2.

so, velocity of ball B is 2m/s

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