What will be the resulting speed of the boat. a 74 kg, Ask an Expert

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Q. A fisherman and his rowboat have a combined mass of 125 kg. Standing in the motionless boat in calm water, he tosses out a 5 kg rock from the back of the boat, with a velocity of 5 m/s. What will be the resulting speed of the boat?

Q. A 74-kg fireman slides down a 4-m pole by applying a frictional force of 384 N against the pole with his hands. If he slides from rest, how fast is he moving once he reaches the ground?

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