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

m (v - u)

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m (u - v)

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- m (v + u)

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none of these

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Solution

The correct option is C $- m (v + u)$
Given : $\to u = u^x$ $\to v = - v^x$
Thus change in momentum $Δ \to P = m (\to v - \to u)$
$∴$ $Δ \to P = m (- v - u) = - m (u + v)$ $^x$

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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:

The correct option is C −m(v+u)Given : →u=u^x →v=−v^xThus change in momentum Δ→P=m(→v−→u)∴ Δ→P=m(−v−u)=−m(u+v) ^x

The correct option is C $- m (v + u)$
Given : $\to u = u^x$ $\to v = - v^x$
Thus change in momentum $Δ \to P = m (\to v - \to u)$
$∴$ $Δ \to P = m (- v - u) = - m (u + v)$ $^x$