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23 November, 02:06

If a car skids 66 ft on wet concrete, how fast was it moving when the brakes were applied? (Round your answer to the nearest whole number.)

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  1. 23 November, 02:10
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    If a car skids 66 ft on wet concrete, it will move at 243 ft/s when the brake is applied.

    Explanation:

    To determine how fast the car was moving, after skidding, the formula below is used:

    V = √32*fd

    V is the car's speed (ft/s)

    d is skid length (ft) = 66 ft

    f is the coefficient of friction determined by the material the car was skidding on.

    Coefficient of friction for wet concrete is 0.65

    V = √32*fd

    V = √32 * 0.65 * 66

    V = 242.679 ft/s ≅ 243 ft/s (nearest whole number)

    If a car skids 66 ft on wet concrete, it will move at 243 ft/s when the brake is applied.
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