43 kg ball rolls toward a TFC player at a speed of 50.0 cm/s, who kicks it back the way it came. The ball leaves the player's foot travelling 30 m/s, and the entire contact with the foot took place in a time of .010 s. Determine the force exerted on the ball by the player's foot. Assume the force exerted was constant for the entire time the foot and the ball were in contact, and ignore any potential frictional forces