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physics

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a 900 N running back moving at 2.0 m/s is stoppped in 0.70 seconds when hit by a lineback. What average foarce did the linebacker exert on the running back?

How much did the running back's momentum change?

  • physics -

    F = m*a
    900N = m*(9.8m/s^2)
    m = 91.8367 kg

    a = (change in velocity) / (change in time)

    a = (Vf - Vi) / (change in time)

    a = (2 - 0) / (.7) = 2.85714 m/s^2

    F = 91.8367 kg * 2.8571 m/s^2 = 262.391 N

  • physics -

    change in momentum:

    p = m*(change in velocity)

    p = 91.8367 kg * (2 m/s) = 183.673 kg*m/s

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