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Physics

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a car crashes into a wall at 25m/s and is brought to rest in .1seconds. Calculate the average force exerted on a 75kg test dummy by the seat belt. How many g-forces is this? (Remember g-force= Force/mg)

  • Physics -

    Your questions are all the same.

    av force = change in momentum/change in time
    or for vanishingly small time and constant mass
    force = mass * acceleration

    initial momentum = m v = 75 * 25
    final momentum = 0
    change in momentum = -75*25
    change in time = .1
    so

    average force = -75*25/.1 = -75*250 newtons

    for number of g s
    75*250/9.8

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