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4.. A toboggan having a mass of 10 kg starts from rest at A and carries a girl and boy having a mass
of 35 kg and 40 kg, respectively. When the toboggan reaches the bottom of the slope at B, the
boy is pushed off from the back with a horizontal velocity of vp/t = 2 m/s, measured relative to
the toboggan. Determine the velocity of the toboggan afterwards. Neglect friction in the
calculation.
3 m
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