Once the first stage of a rocket burns out, it separates and falls back to Earth. Before the second stage starts burning, the rocket slows down at a rate of 13 m/s2 [DOWN] for a short time. If the rocket slows from 1200 m/s [up] over a period of 4.8 seconds, what is the speed of the rocket after this deceleration?

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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.