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9 May, 10:54

Two football players are pushing a 60kg blocking sled across the field at a constant speed of 2.0 m/s. The coefficient of kinetic friction between the grass and the sled is 0.30. Once they stop pushing, how far will the sled slide before coming to rest

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  1. 9 May, 11:14
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    The sled slides 0.68m before rest.

    Explanation:

    Vi = 2 m/s

    m = 60kg

    μ = 0.3

    N = m * g = 60kg * 9.8 m/s² = 588 N

    Fr = μ * N

    Fr = 176.4 N

    a = Fr/m

    a = - 2.94m/s²

    t = Vi/a

    t = 0.68 seg

    d = Vi*t - a*t²/2

    d = 0.68m
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