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An open elevator is ascending with const...

An open elevator is ascending with constant speed `v=10m//s.` A ball is thrown vertically up by a boy on the lift when he is at a height `h=10m` from the ground. The velocity of projection is `v=30 m//s` with respect to elevator. Find
(a) the maximum height attained by the ball.
(b) the time taken by the ball to meet the elevator again.
(c) time taken by the ball to reach the ground after crossing the elevator.

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