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23 August, 12:37

A car moving at 50 km/hr skids 20 m with locked brakes. how far will the car skid with locked brakes if it were traveling at 150 km/hr?

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  1. 23 August, 15:29
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    The energy to be dissipated is proportional to 1/2 m v^2 ie proportional to v^2 for the same car

    In turn F * d = work done.

    F is constant (same brakes)

    so d is proportional to v^2

    if v is multiplied by 3 then d is multiplied by 3^2 = 9

    distance = 180m
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