A man in a balloon throws a stone downwards with a speed of `5 m//s` with respect to balloon. The balloon is moving upwards with a constant acceleration of `5 m//s^2`. Then velocity of the stone relative to the man after `2` seconds is.

Options

A. `10 m//s`
B. `30 m//s`
C. `15 m//s`
D. `35 m//s`

Answer

D

Explanation

Relative velocity of stone `= 5 m//s`
Relative acceleration of stone
=` 10 + 5 = 15 m//s^2`
`v = u+ at = 5 + 15 xx 2 = 35 m//s`
relative velocity after `t = 2` seconds is `35 m//s`.