A body of mass 'm' and velocity 'u' strikes a wall and rebounds with velocity 'v'. The change in momentum is:

m(v−u)

m(u−v)

−m(v+u)

none of these

A

m(v−u)

B

m(u−v)

C

none of these

D

−m(v+u)

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Solution

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Given : →u=u^x→v=−v^x

Thus change in momentum Δ→P=m(→v−→u)

∴Δ→P=m(−v−u)=−m(u+v)^x

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