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A balloon is rising up along the axis of...

A balloon is rising up along the axis of a concave mirror of radius of curvature `20 m` A ball is dropped from the balloon at a height `15m` from the mirror when the balloon has velocity `20m//s` .Find the speed of the image of the ball formed by concave mirror after `4` seconds[take:`g=10m//s^(2)`]

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