A car is stopped at a traffic light. It then travels along a straight road so th

Question

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)=bt^2-ct^3 , where b = 2.50 and c = 0.130 . Part A Calculate the average velocity of the car for the time interval = 0 to = 10.0 . Part B Calculate the instantaneous velocity of the car at =0. Part C Calculate the instantaneous velocity of the car at =5.00 . Part D Calculate the instantaneous velocity of the car at =10.0 . Part E How long after starting from rest is the car again at rest?

Explanation / Answer

v = 5t -0.39t^2 a. v instantaneous = 0 m/s at t=0 c. v at t=5 = 15.25 m/s d. v at t= 10 = 11 m/s e. t = 19.23 sec

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