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ID: past-exam-of-the-physics-1-paper-of-the-university-of-oxford/2015/3
Take as the constant mass of the sled and rider when snow is immediately removed. Assume the falling snow has zero horizontal velocity in the ice frame, and its arrival rate is the specified constant mass flux onto the sled. In a snow-collecting sled, horizontal momentum flux, including the departing snow, determines the change in sled momentum.
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