# linear momentum

an 85kg fisherman jumps from a dock into a 135kg rowboat at rest on the west side of the dock, if the velocity of the fisherman is 4.3m/s to the west as he lives the dock, what is the final velocity of the fisherman and the boat?

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1. momentum of the system is conserved, so (ignoring the very real resistance of the water)

4.3*85 = (85+135)v
v = 1.66 m/s

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2. why are the man and the boat's final velocity the same?

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3. The fisherman is jumping into the boat so their masses become combined as they are one "object".

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