A classical mechanics problem by Roche Periyanayagam

Classical Mechanics Level pending

A boy, who is standing on a pole of height 14.7 m throws a stone vertically upwards. It moves in a vertical line slightly away from the pole and falls on the ground. Its equation of motion in meters and seconds is x = 9.8 t − 4.9t2

Find the time taken for upward and downward motions.

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