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At one particular moment, a 15.0 kg toboggan is moving over a horizontal surface of snow...

At one particular moment, a 15.0 kg toboggan is moving over a horizontal surface of snow at 3.00 m/s. After 7.25 s have elapsed, the toboggan stops. Use a momentum approach to find the magnitude of the average friction force (in N) acting on the toboggan while it was moving.

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