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Q. A 340kg piano slides 3.50 m down a 31° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.35. Calculate the force exerted by the man. Determine the work through the piano.

Q. A 50 g Super Ball travelling at 28 m/s bounces off a brick wall and rebounds at 18 m/s. A high-speed camera records this event. If the ball is in contact with wall for 5 ms, what is the magnitude of the average acceleration of the ball throughout this time interval? (Note: 1 ms = 10-3 s.)

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