March 30, 2017

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Suppose a car is traveling at +22.0 m/s, and the driver sees a traffic light turn red. After 0.560 s has elapsed (the reaction time), the driver applies the brakes, and the car decelerates at 4.00 m/s2. What is the stopping distance of the car, as measured from the point where the driver first notices the red light?

  • Physics - ,

    v = 22.0m/s
    a = -4.00m/s²
    Use the equations:
    (1) 0 = v + a t
    (2) s = v t + a t²/2
    Solve (1) for t.
    Substitute to solve (2) for s.

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