What Is the Speed and Acceleration of a Soccer Ball After a Collision?

[hazex36]

The questions is
A 60-kg soccer player jumps vertically upwards and heads the .45kg ball as it is descending vericallywith a speed of 25 m/s. If the player was moving upward with a speed of 4.0m/s just before the impact, what will be the speed of the ball immediately after the collision if the ball rebounds vertically upwards and the collision is elastic? If the ball is in contact with the palyer's head for 20ms, what is the average acceleration of the ball?

thanks in advance

 

[phyzmatix]

The questions is
A 60-kg soccer player jumps vertically upwards and heads the .45kg ball as it is descending vericallywith a speed of 25 m/s. If the player was moving upward with a speed of 4.0m/s just before the impact, what will be the speed of the ball immediately after the collision if the ball rebounds vertically upwards and the collision is elastic? If the ball is in contact with the palyer's head for 20ms, what is the average acceleration of the ball?

thanks in advance

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