Asked by Anonymous

61 kg soccer player jumps vertically upwards and heads the 0.45 kg ball as it is descending vertically with a speed of 29 m/s. If the player was moving upward with a speed of 4.0 m/s just before impact, what will be the speed of the ball immediately after the collision if the ball rebounds vertically upwards and the collision is elastic?
Answered by bobpursley
Use the conservation of momentum, and conservation of energy equations to find the velocities of the ball and person after collision. I will be happy to critique your thinking.