A basketball bounces on a floor. The ball has a mass of 0.61 kg and is in contact with the floor for 0.015 seconds. If the average total force acting on the ball during contact with the floor is 300 N and the ball rebounds with a speed of 3.5 m/s, calculate the speed of the ball just before it hits the floor.   What would the effect on the average force be if the contact time were to increase?

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