23. A cannon is fired over level ground at an angle of 25° to the horizontal. The initial velocity of the cannonball is 120 m/s. How long is the cannonball in the air? How far does the cannonball travel horizontally?

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Q: The SI unit for length is: kilometer mile meter inch

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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.