A 60-kg soccer player jumps vertically upwards and headsthe 0.45-kg ball as it is descending vertically with a speed of25 m/s. (a) If the player was moving upward with a speed of4.0 m/s just before impact, what will be the speed of the ballimmediately after the collision if the ball rebounds verticallyupwards and the collision is elastic? (b) If the ball is in contactwith the player’s head for 20 ms, what is the average accelerationof the ball? (Note that the force of gravity may be ignoredduring the brief collision time.)

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