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10 December, 19:48

skid marks about 6.7 km long. If the car had an initial speed of 425 km/h, estimate the coefficient of kinetic friction. The acceleration of gravity is 9.81 m/s 2.

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  1. 10 December, 23:04
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    Explanation: F=umg where u is coefficient of kinetic friction.

    But F=ma.

    a = u^2/2S

    U = 425km/hr = (425*1000) / 3600 = 118m/s

    S = 6.7km = 6700m

    a = 118*118 / (2*6700) = 1.04m/s

    u = 1.04/9.8 = 0.11
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