Question

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$(g=9.8m{s}^{-2})$

• A. 100 m
• B. 200 m
• C. 400 m
• D. 150 m

Answer 1

The correct option is B 200 m

For stone to be dropped from rising balloon of velocity$29m/s$

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

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