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A ball is thrown vertically upwards with...

A ball is thrown vertically upwards with a velocity of `25 ms^(-1)` from the top of a tower of height 30m . How long will it travel before it hits ground

A

6s

B

5sec

C

4sec

D

12s

Text Solution

Verified by Experts

The correct Answer is:
A
`S = ut + 1/2 g t^2`

`rArr 30 = -25t + 1/2 xx 10 xx t^2`
`rArr t^2 - 5t - 6 = 0 rArr (t - 6)(t+1) = 0`
t = 6sec
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