Physics Homework: What is the average force exerted on the ball by the wall?

A )3.45 kg steel ball strikes a wall with a speed of 10.0 m/s at an angle of 60 degrees with the surface. It bounces with the same speed and angle. If the ball is in contact with the wall for 0.200s what is the average force exerted on the ball by the wall?

a) X-component? (answer in N)
b) y-component? (answer in N)

Sol:

   a)  M=3kg, U=10m/s,V=-10m/s, angle=60, t=0.2sec

V=U+at

-10=10+a*0.2

a=-20/0.2

 =-100m/s

F=ma=3*(-100)

    =-300N

F_x = Fcos(60)

  = -300cos(60)= -150N

  b) F_y = Fsin(60)

  = -300sin(60)= -259.80N