A balloon is rising up along the axis of a concave mirror of radius of curvature \( 20 \mathrm{~...

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A balloon is rising up along the axis of a concave mirror of radius of curvature \( 20 \mathrm{~m} \). A ball is dropped from the balloon at a height \( 15 \mathrm{~m} \) from the mirror when the balloon has velocity \( 20 \mathrm{~m} / \mathrm{s} \). Find the speed of the image of the ball (in \( \mathrm{m} / \mathrm{s} \) ) formed by concave mirror after 4 second?
[Take: \( g=10 \mathrm{~m} / \mathrm{s}^{2} \) ]
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