A 1 kg particle strikes a wall with a velocity 1 m/s at an angle 30∘ and reflects at the same angle in 0.1 second, then the force applied by the wall on the particle will be
Velocity component only changes perpendicular to the wall and remains unchanged along the wall.
Therefore, change in momentum of the ball perpendicular to the wall
△p=p2−p1=m[vcosθ−(−vcosθ)]
△p=2mvcosθ
△p=2×1×1×cos30∘=2×√32=√3,
Force = Rate of change of momentum
F=Change of momentumtime
F=√30.1=10√3
So force =10√3 N.