1.

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

Answer»

`(-R^(2)V)/([2(d-Vt)-R]^(2)),V[1+(R^(2))/([2(Vt-d)-R]^(2))]`
`(R^(2)V)/([2(d+Vt)+R]^(2)),V[1+(R^(2))/(2[Vt-d-R]^(2))]`
`(-R^(2)V)/([2(d-Vt)+R]^(2)),V[1-(R^(2))/([2(Vt-d)+R]^(2))]`
`(-R^(2)V)/([(d-Vt)-R]^(2)),V[1-(R^(2))/([2(Vt+d)-R]^(2))]`

ANSWER :A


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