13. A 5 kg block accelerates with no friction down a hill and enters a circular loop of radius 10 m. The starting height above the bottom of the loop is 40 m. Find the force the track exerts on the block at the top and bottom of the loop.

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.