Question

A man in a balloon throws a stone downwards with a speed of $5m{s}^{-1}$ with respect to the balloon which is moving upwards with a constant acceleration of $5m{s}^{-2}$ . Find the velocity (in $m{s}^{-1}$ ) of the stone relative to the man after $2s$ . (Take $g=10m{s}^{-2}$ )

Answer 1

Answer: 35

Relative velocity of stone = $5m{s}^{-1}$
relative acceleration of stone = $10+5=15m{s}^{-2}$
$v=u+at=5+15\times 2=35m{s}^{-1}$
relative velocity after $t=2s$ is $35m{s}^{-1}$