Question 9 A ball (m= 0.2kg and V1 = 8 m/s) is moving toward a wall ( V= 0) and after a collision, returns with V2 = 2 m/s ( Opposite direction) a. What is the momentum before and after collision? b. Is it an elastic or inelastic collision? Why? O a) p( before) = 1.6 kg m/s p(after) = -0.4 kg m/s b) it's an elastic because Kinetic energy is constant before and after collision O a) p( before) = 1.6 kg m/s p(after) = -0.4 kg m/s b) it's an inelastic because velocity of the ball changed after collision. O a) p( before) = 1.6 kg m/s p(after) = -0.4 kg m/s b) it's an inelastic because Kinetic energy is not constant before and after collision O a) p( before) = 1.6 kg m/s p(after) = 0.4 kg m/s b) it's an elastic because Kinetic energy is not constant before and after collision