You’re driving to Carey Lake to get the last rays of summer when the light turns red at the Umtanum intersection. You just pass Koletty’s, so you know you know you are exactly 110 m from the intersection. If your reaction time is half a second and you were driving 20 m/s before the light changed, what acceleration will bring you to a stop right at the edge of the intersection? [-2 m/s2]

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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.