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11 April, 10:45

A 5000kg car traveling at 40m/s crashes into a wall and comes to a complete stop in 10ms. What was the force on the wall?

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  1. 11 April, 12:59
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    20,000,000 N

    Explanation:

    First find the acceleration:

    a = Δv / Δt

    a = (0 - 40 m/s) / 0.010 s

    a = - 4000 m/s²

    Next use Newton's second law to find the force on the car:

    F = ma

    F = (5000 kg) (-4000 m/s²)

    F = - 20,000,000 N

    According to Newton's third law, the force on the wall is equal and opposite the force on the car.

    F = 20,000,000 N
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