Question: A ball is thrown vertically upwards with velocity 20 m/s from a height of 20m from ground. After colliding with the ground it just

A ball is thrown vertically upwards with velocity 20 m/s from a

A ball is thrown vertically upwards with velocity 20 m/s from a height of 20m from ground. After colliding with the ground it just reaches the starting point, then the coefficient of restitution between the ball and the ground (9 = 10m/sec") is (A) (B) v2 (C) 3 (D)

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