A 3 kg ball strikes a heavy rigid wall with a speed of 10 ms at an angle of 60°. It gets reflected with the wall is for 0.20 s, what is the average force exerted on the ball by the wall ?

Options

A. 150 N
B. zero
C. `150 sqrt3 N`
D. 300 N

Answer

c

Explanation

`Deltap = m upsilon sin theta-(-m upsilon sin theta)`
`= 2 m upsilon sin theta`
`F=(Deltap)/(Deltat)=(2xx3xx10)/(0.2)xx(sqrt3)/(2)=150sqrt3N`
(C) is the choice.