A small block of mass \( m \) and a concave mirror of radius \( R \...

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A small block of mass \( m \) and a concave mirror of radius \( R \) fitted with a stand lie on a smooth horizontal table
P with a separation \( d \) between them. The mirror together with its stand has a mass \( m \). The block is pushed at
W \( t=0 \) towards the mirror so that it starts moving towards the mirror at a constant speed \( V \) and collides with it. The collision is perfectly elastic. Find the velocity of the image (a) at a time \( td / V \), (b) at a time \( td / V \).
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