A ball falls freely from a height of 45m. When the ball is at a height of 25m, it explodes into two equal piece. One of them moves horizontally with a speed of `10ms^(-1)`. The distance between the two pieces on the ground is

Options

A. 20 m
B. 30 m
C. 40 m
D. 60 m

Answer

A

Explanation

Remaining time for the pieces to reach the ground will be,

`t = (sqrt(2 xx45)/(10))10 - (sqrt(2 xx 20)/(10)) = 1s`
`x=10 xx1 = 10m`
`therefore` Distance between two pieces will be 20 m.