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7 August, 18:51

4. How much force is required to stop a 60 kg person traveling at 30 m/s during a time of a)

5.0 seconds

b) 0.50 seconds

c) 0.05 seconds

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Answers (1)
  1. 7 August, 18:54
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    F = ma, and a = Δv / Δt.

    F = m Δv / Δt

    Given: m = 60 kg and Δv = - 30 m/s.

    a) Δt = 5.0 s

    F = (60 kg) (-30 m/s) / (5.0 s)

    F = - 360 N

    b) Δt = 0.50 s

    F = (60 kg) (-30 m/s) / (0.50 s)

    F = - 3600 N

    c) Δt = 0.05 s

    F = (60 kg) (-30 m/s) / (0.05 s)

    F = - 36000 N
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