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11 November, 12:21

A 980 kg car uses a braking force of 9600 N to stop in 1 seconds.

(a) What impulse acts on the car?

(b) What is the change in momentum of the car?

(c) What was the initial speed of the car? (Use only two decimal places.)

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  1. 11 November, 14:37
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    (a). Impulse = (force) x (time) = (9,600 N) x (1 sec) = 9,600 N-sec

    (b). change in momentum = impulse delivered = 9,600 N-sec = 9,600 kg-m/s

    (c). The car's initial momentum was 9,600 kg-m/s.

    Momentum = (mass) x (speed)

    9,600 kg-m/s = (980 kg) x (initial speed)

    initial Speed = (9,600 kg-m/s) / (980 kg)

    initial Speed = 9.79 m/s
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