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Q. Suppose the roller coaster (h1 = 37 m, h2 = 13 m, h3 = 25) passes point A with a speed of 3.00 m/s. If the average force of friction is equal to one fifth of its weight, with what speed will it reach point B? The distance traveled is 50.0 m.

Q. A 89 kg water skier floating in a lake is pulled from rest to a speed of 10 m/s in a distance of 25 m. What is the net force exerted on the skier, assuming his acceleration is constant?

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