Question

an elevator with out a ceiling is ascending up with an acceleration of 5m/s^2 .a boy on the elevator shoots a ball in vertically upward direction from a height of 2m above the floor of elevator at this instant the elevator is moving up with a velocity of 10m/s and the floor of elevator is at the height of 50m from ground the initial speed of the ball is 15m/s w.r.t the elevator then the time in which the ball strikes the floor of the elevator?

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