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A ballon is moving vertically up with a ...

A ballon is moving vertically up with a velocity 4 m/s. When it is at a height `h`, a body is gently released from it. If it reaches ground in 4 sec, the height of balloon, when the body is released, is: (Take `g = 9.8 m//s^(2)`)

A

62.4 m

B

42.4 m

C

78.4 m

D

82.2 m

Text Solution

Verified by Experts

The correct Answer is:
A
`s = ut + (1)/(2) at ^(2)`
`h = -4 xx 4 + (1)/(2) xx 9.8 xx (4)^(2) = - 16 + 78.4 = 62.4 m`
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