A balloon is rising vertically up with a velocity of 29 $m s^{- 1}$ . A stone is dropped from it and it reaches the ground in 10 seconds. The height of the balloon when the stone was dropped from it is $(g = 9.8 m s^{- 2})$

100 m

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200 m

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400 m

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150 m

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Solution

The correct option is B 200 m
For stone to be dropped from rising balloon of velocity $29 m / s$

$u = - 29 m / s, t = 10 s e c .$

$∴ h = - 29 \times 10 + \frac{1}{2} \times 9.8 \times 100$
$= - 290 + 490 = 200 m .$

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