Suppose that a 112.5 kg football player running at 7.5 m/s catches a 0.43 kg ball moving at a speed of 25 m/s with his feet off the ground, while both of them are moving horizontally.

b) Calculate the change in kinetic energy of the system, in Joules, after the player catches the ball.

c) Calculate the final speed of the player, in meters per second, if the ball and player are initially moving in opposite directions.

d) Calculate the change in kinetic energy of the system, In Joules, in this case.