A ball is thrown vertically downwards from a height of 20 m with an initial velocity v 0 . It collides with the ground, loses 50 percent of its energy in collision and rebounds to the same height. The initial velocity v 0 is: (Take g = 10 m s - 2 )

Question

A ball is thrown vertically downwards from a height of 20 m with an initial velocity v 0 . It collides with the ground, loses 50 percent of its energy in collision and rebounds to the same height. The initial velocity v 0 is: (Take g = 10 m s - 2 ), 20 m s - 1, 28 m s - 1, 10 m s - 1, 14 m s - 1

MARKS App · Accepted Answer

kinetic energy of the ball on reaching ground K E 1 = m g h + 1 2 m v 0 2 after collision K E 1 2 = m g h m g h + 1 2 m v 0 2 2 = m g h v 0 = 2 g h = 20 m s − 1

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