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25 August, 03:21

A 1000kg car is moving at 10m/s. A 400N force is on the car for 5 seconds. What is the change in momentum of the car.

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  1. 25 August, 03:24
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    From Newton's second law of motion,

    F = m*a

    = m * (change in velocity) / time [As a = (change in velocity) / time]

    From the question, we know

    F = 400 N, time = 5 s

    Therefore,

    400 = 1000 * (change in velocity) / 5

    i. e. change in velocity = 2 m/s

    Momentum = m * velocity

    Therefore,

    Change in momentum = (change in mass) * (change in velocity)

    = 1 * (change in velocity) [As m remains the same]

    = 1 * 2

    = 2 kgm/s
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