A body of mass 3 kg hits a wall at an angle of `60^(@)` & returns at the same angle. The impact time was 0.2s. Calculate the force exerted on the wall:

Options

A. `150 sqrt(3) N`
B. `50 sqrt(3) N`
C. 100 N
D. `75 sqrt(3) N`

Answer

A

Explanation

`F = (Delta P)/(Delta t) = (mv cos 30^(@) -(- mv cos 30^(@)))/(Delta t)`
`= (2 mv cos 30^(@))/(Delta t) = (2 xx 3 xx 10 xx sqrt(3))/(0.2 xx 2) = 150 sqrt(3) N`