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.

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` second is `35 m//s`.