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    Coco25's Avatar
    Coco25 Posts: 1, Reputation: 1
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    #1

    Nov 20, 2007, 12:02 PM
    Physics momentum
    A car moving at 20 m/s crashes into a wall and is brought to rest in 0.1 s. What is the average force in kN exerted on a 75-kg dummy by the seat belt?
    terryg752's Avatar
    terryg752 Posts: 197, Reputation: 4
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    #2

    Nov 20, 2007, 05:31 PM
    Average deceleration = 20/.1 = 200

    Average force = 200 times mass = 200 x 75 /1000 kN = 15 kN
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