# A car is stopped at a traffic light

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A car is stopped at a traffic light. It then travels along a straight road so that its distance from the light is given by x (t) = bt2 - ct', where b = 2.40m/S2 and c = O.I20m/s'.

(a) Calculate the average velocity of the car for the time interval t = 0 to t = 10.0 s.

(b) Calcn1ate the instantaneous velocity of the car at t = 0, t = 5.0 s, and t = 10.0 s.

(c) How long after starting from rest is the car again at rest?

(a) Calculate the average velocity of the car for the time interval t = 0 to t = 10.0 s.

(b) Calcn1ate the instantaneous velocity of the car at t = 0, t = 5.0 s, and t = 10.0 s.

(c) How long after starting from rest is the car again at rest?

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