physics 1

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You are driving your car, and the traffic light ahead turns red. You apply the brakes for 2.13 s, and the velocity of the car decreases to +4.90 m/s. The car's deceleration has a magnitude of 3.55 m/s2 during this time. What is the car's displacement?

  • physics 1 -

    if the initial velocity was v,

    v - 3.55*2.13 = 4.90
    v = 12.46 m/s

    the displacement s is thus

    s = 12.46*2.13 - 3.55/2 * 2.13^2
    s = 18.49 m

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