A 74 kg soccer player jumps vertically upwards and heads the0.45 kg ball as it is descending vertically with a speed of 26 m/s.If the player was moving upward with a speed of 4.0 m/s just beforeimpact, what will be the speed of the ball immediately after thecollision if the ball rebounds vertically upwards and the collisionis elastic?
If the ball is in contact with the player's head for 20 ms, what isthe average acceleration of the ball? (Note that the force ofgravity may be ignored during the brief collision time.)
