A 1.0 kg ball drops vertically onto a floor, hitting with a speed (just before hitting floor) of 20 m/s. It rebounds with a speed (just after leaving floor) of 15 m/s. (a) What is the magnitude of the impulse that acts on the ball during the contact?(b) If the ball is in contact with the floor for 0.040 s, what is the magnitude of the average force exerted on the floor?

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