A 3 kg body strikes a smooth wall at an angle of 60° with the wall and rebounds at the same angle with speed 10 m s⁻¹. Impact time is 0.2 s. Find average force on the wall.

Question

G1 Physics · Accepted Answer

The incident and rebound paths each make 60° with the plane of the wall. Speed normal to the wall is v sin60°=5√3 m s⁻¹. It reverses on reflection, giving impulse =2×3×5√3=30√3 N s. Force magnitude =30√3/0.2=150√3 N. Answer: A.