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# 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(vu)
B
m(uv)
C
none of these
D
m(v+u)
Solution
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#### Given : →u=u^x→v=−v^xThus change in momentum Δ→P=m(→v−→u)∴ Δ→P=m(−v−u)=−m(u+v) ^x

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