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    1) A policeman investigating an accident measures the skid marks left by a car. He determines that the distance between the point that the driver slammed on the brakes and the point where the car came to a stop was 34.0 m. From a reference manual he determines that the coefficient of kinetic friction between the tires and the road under the prevailing conditions was 0.300. How fast was the car going when the driver applied the brakes? (This car was not equipped with anti-lock brakes.)
    10.7 m/s
    14.1 m/s
    21.4 m/s
    32.9 m/s

    © BrainMass Inc. brainmass.com December 24, 2021, 6:23 pm ad1c9bdddf
    https://brainmass.com/physics/velocity/kinematics-fast-car-going-110443

    SOLUTION This solution is FREE courtesy of BrainMass!

    A policeman investigating an accident measures the skid marks left by a car. He determines that the distance between the point that the driver slammed on the brakes and the point where the car came to a stop was 34.0 m. From a reference manual he determines that the coefficient of kinetic friction between the tires and the road under the prevailing conditions was 0.300. How fast was the car going when the driver applied the brakes? (This car was not equipped with anti-lock brakes.)
    10.7 m/s
    14.1 m/s
    21.4 m/s
    32.9 m/s

    Answer: 14.1 m/s
    Uniformly accelerated motion

    V0= initial velocity
    Vf= final velocity
    a= acceleration
    delta s= displacement

    Equation used:
    Vf ^2 = Vi ^2 + 2 a delta s

    V0= initial velocity = ? m/s
    Vf= final velocity = 0 m/s
    delta s= displacement = 34 m
    Mu = 0.3
    g= 9.81 m/s^2
    a=Mu g= 2.94 m/s^2

    Vi=square root of (2 a delta s) 14.1 m/s

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com December 24, 2021, 6:23 pm ad1c9bdddf>
    https://brainmass.com/physics/velocity/kinematics-fast-car-going-110443

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