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A ball is thrown vertically upwards with...

A ball is thrown vertically upwards with a velocity of `20 m s^(-1)` from the top of a multistore building of 25 m high. How high will the ball rise? (Take g = `10 m s^(-2)`)

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The correct Answer is:
(i) 20 m (ii) 5s
(i) Height =upward area under v-t curve `=20 m`

(ii) Total time of flight `=2+3=5` sec
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