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29 November, 06:57

A 4,000-kg car traveling at 20 m/s hits a wall with a force of 80,000 N and comes to a stop. What was the impact time?

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  1. 29 November, 07:16
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    Deceleration a=Δv/t - > t=Δv/a

    Δ v=20 m/s (from 20m/s to 0m/s)

    from Newton's second law of motion: a=F/m

    F=80000N

    m=4000kg

    a=80000/4000=20 m/s^2

    t=20m/s / 20 m/s^2 = 1s
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