nd dart move rightward. The thrower measures the speed of the dart to be 50 /s. An external observer, at rest with respect to the earth, measures the speed the boxcar to be 15 m/s. What does the external observer measure the speed the dart to be? Same as problem 4 except the dart is thrown leftward while the boxcar moves ghtward.

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Q: None

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Q: o its just the same answer youre just adding a degree sign

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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.