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A balloon going upward with a velocity o...

A balloon going upward with a velocity of `12m//s` is at a height of `65m` from the earthh surface at any instant. Exactly at this instant a packet drops from it. How much time will the packet take in reaching the surface of earth?(Take `g=10m//s^(2)`)

A

7.5 sec

B

10 sec

C

5 sec

D

None

Text Solution

Verified by Experts

` h= - ut + 1//2 "gt"^(2) rArr 65 = - 12t + 5t^(2)`
` rArr 5t^(2) - 12 t - 65 - 0 rArr t = 5 ` sec
Hence correct answer is ©
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