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March 27, 2017

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The driver of the car traveling at a constant 25m/s sees a child suddenly run into the road. It takes the driver 0.45s to hit the brakes. As it slows, the car has a steady acceleration of 8.5m/s©ü. What the total distance the car move before it stops.

  • physics - ,

    Before hitting the brakes, the car travels 0.45 s * 25 m/s = 11.25 m

    While decelerating, it travels for
    t = 25/8.5 = 2.94 seconds. During that time it travels 12.5 m/s*2.94s = 36.8 m

    Add the two distances

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