A person kicks a ball off a cliff with a velocity of 20 m/s, 30° from the horizontal. It takes 20 seconds to hit the ground, 1. Find the height of the cliff. 2. Find the final vertical velocity of the ball just before it hits the ground. 3. Find the total horizontal range travelled by the ball. 4. Find the magnitude of the final velocity of the ball just before it hits the ground. 5. Find the direction of the final velocity of the ball just before it hits the ground.

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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.