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 – ct³, where b = 2.70 m/s² and c = 0.120 m/s³. Part a Calculate the average velocity of the car for the time interval t = 0 to t = 10.0 s. Part b Calculate the instantaneous velocity of the car at t = 0.

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.