science(physics)

A bullet of mass 100g moving with20m/sec .Strikes a wooden plank and peretrates up to 20cm.Calculate the resistance offered by the wooden plank.

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  1. momentum = 0.100 * 20 = 2 kg m/s

    distance into plank = .020 meter
    average speed in plank = 20/2 = 10 m/s
    time in plank = .020/10 = .002 s

    average force = change in momentum/time
    = 2/.002 = 1000 Newtons

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