A body is dropped from a balloon moving up with a velocity of `4 m//s`, when the balloon is at a height of 120 m from the ground. The height of the body after 5 s from the ground is:

Options

A. 5 m
B. 10 m
C. 15 m
D. 20 m

Answer

C

Explanation

`O`: origin
`-h=ut-1/2g t^(2)=4xx5-1/2xx10xx(5)^(2)`
`=20-125=-105 m`
i.e., body is `105m` below `O`.
Distance from the ground`=120-105=15 m`