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30 September, 16:22

A 912-kg car is being driven down a straight, level road at a constant speed of 31.5 m/s. When the driver sees a police cruiser ahead, she removes her foot from the accelerator. After 8.00 is, the speed of the car is 24.6 m/s, which is the posted speed limit. What is the magnitude of the average net force acting on the car during the 8.00 s interval

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  1. 30 September, 16:47
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    786.6 N

    Explanation:

    mass of car, m = 912 kg

    initial velocity of car, u = 31.5 m/s

    final velocity of car, v = 24.6 m / s

    time, t = 8 s

    Let a be the acceleration of the car

    Use first equation of motion

    v = u + a t

    24.6 = 31.5 + a x 8

    a = - 0.8625 m/s^2

    Force, F = mass x acceleration

    F = 912 x 0.8625

    F = 786.6 N

    Thus, the force on the car is 786.6 N.
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