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When you see a traffic light turn red, you apply the brakes until you come to a stop. Suppose your initial speed was 12.9 m/s, and you come to rest in 35.0 m. How much time does this take? Assume constant deceleration.

What equation do I use to solve this problem? You can show me some steps to solve the problem. Thanks

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Chad

  1. V^2 = Vo + 2ad.
    V = 0.
    Vo = 12.9 m/s.
    d = 35 m.
    a = ?. Solve for a. It will be negative.

    V = Vo + at.
    V = 0.
    Vo = 12.9 m/s.
    a = Previous calculated value.
    t = ?.

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    Henry

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