physics

It's a snowy day and you're pulling a friend along a level road on a sled. You've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. You've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 33.0∘ angle. You estimate that the mass of the sled, with your friend on it, is 71.0kg and that you're pulling with a force of 89.0N. what answer will you give

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  1. v=const => Net force =0 =>
    Fcosα=F(fr) =μN=μmg
    μ= Fcosα/mg=89•cos33/71•9.8=0.1

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  2. 94

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  3. 57 N

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