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A ball is thrown vertically upwards with...

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

A

6 s

B

5 s

C

4 s

D

12 s

Text Solution

Verified by Experts

The correct Answer is:
A
`s=ut+(1)/(2)g t^(2)`
`therefore 30=-25t+(10)/(2)t^(2)`
or `t^(2)-5t-6=0`
or `(t-6)(t+1)=0`
`therefore t=6s`
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