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11 June, 11:58

A 55 kg ice skater is gliding along at 3.5 m/s. Five seconds later her speed has dropped to 2.8m/s. What is the magnitude of the kinetic friction acting on her skates?

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  1. 11 June, 12:24
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    7.7 N

    Explanation:

    ∑F = ma

    F = m Δv/Δt

    F = (55 kg) (2.8 m/s - 3.5 m/s) / 5 s

    F = - 7.7 N

    The magnitude of the force of kinetic friction is 7.7 Newtons.
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