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    pinkwya's Avatar
    pinkwya Posts: 6, Reputation: 1
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    #1

    Nov 15, 2011, 09:50 AM
    Work energy principle
    At an accident sense on a level road investigators measure a car's skid mark to be 88 m long . The accident occurred on a rainy day , and the cofficient of kinenatic friction was estimated to be 0.42 . Use these data to determine the speed of the car when the driver slammed on (and locked)the brackes ( Why does the car mass doesnot matter?)
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Nov 15, 2011, 09:55 AM
    The braking force is , and using you get



    So you can solve for 'a,' and from that figure out the initial velocity. Note how the 'm' terms cancel out - the idea being that while it takes more force to slow a heavier object, the friction against the road (and hence stopping force) is greater for a heavier object.
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