Two billiard balls each of mass 0.05 kg moving in opposite directions with speed 6 m/s collide and r

Question

Two billiard balls each of mass 0.05 kg moving in opposite directions with speed 6 m/s collide and rebound with the same speed. What is the magnitude of the impulse imparted to each ball due to the other?

Professor PC Thomas Classes · Answer

Initial momentum of one ball $p_i = 0.05 	imes 6 = 0.3$ kg m/s. Final momentum $p_f = -0.05 	imes 6 = -0.3$ kg m/s. Impulse = change in momentum = $p_f - p_i = -0.6$ kg m/s. Magnitude is 0.6 N s.