A 80-kg soccer player jumps vertically upwards and heads the 0.45-kg ball as it is descending vertically with a speed of 22 m/s. (Note that the force of gravity may be ignored during the brief collision time.) (a) 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?  m/s (b) If the ball is in contact with the player's head for 25 ms, what is the average acceleration of the ball?  m/s2

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