A particle of mass \(m\) moves with velocity \(V_{0}=20 \mathrm{~m} / \mathrm{sec}\) towards a l....

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A particle of mass \(m\) moves with velocity \(V_{0}=20 \mathrm{~m} / \mathrm{sec}\) towards a large wall that is moving with velocity \(V=5 \mathrm{~m} / \mathrm{sec}\). towards a particle as shown. If the particle collides with the wall elastically, the speed (in \(\mathrm{ms}^{-1}\) ) of the particle just after the collision is:
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