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3 October, 00:57

A car of mass 920.0 kg accelerates away from an intersection on a horizontal road. When the car speed is 39.6 km/hr (11.0 m/s), the net power which the engine supplies is 4100.0 W (in addition to the extra power required to make up for air resistance and friction). Calculate the acceleration of the car at that time.

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  1. 3 October, 01:48
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    Power mgh/t

    Mg = force

    H/t = velocity

    Power = force * velocity

    Power = 4100W

    Velocity = 11.0m/s

    Force = power / velocity

    Force = 4100/11

    Force = 372.73N

    F=ma

    a = f/m

    a = 372.73/920

    a = 0.405m/s^2
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