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March 27, 2017

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A car whose brakes are locked skids to a stop in 200 ft from an initial velocity of 50 mi/hr. Find the coefficient of sliding friction.

  • Physics - ,

    First convert 50 mi/hr to ft/s
    Vo= 73.33 ft/s
    g = 32.2 ft/s^2

    M*Vo^2/2 = M*g*Uk*X
    M cancels out
    Vo^2 = 2*g*Uk*X = 5378 ft/s^2
    Uk = 5378/(2*32.2*200)= 0.4175

  • Physics - ,

    thank you!

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