A ball is thrown vertically upwards with...

A ball is thrown vertically upwards with a velocity of `20 ms^(-1)` from the top of a multi-storey building. The height of the point from where the boll is thrown is 25.0m from the ground (a) How high will the ball rise? and (b) How long will it take to reach the ground?

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(a) 20 m (b) 5 sec

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