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Q.

A balloon is rising up along the axis of a stationary concave mirror of radius of curvature 20m. A ball is dropped form the balloon at a height 15m from the mirror when the balloon has velocity 2m/s. Find speed of the image of the ball formed by concave mirror after 0.4 sec from the instant at which it was dropped (in m/s) $[g = 10 m / s^{2}]$

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answer is 8.

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Detailed Solution

$V_{I} = - m^{2} v_{0} = 8$

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