5. Ali throws a stone vertically upward from rest and then the ball falls down on the ground as seen in the sketch below (Notice the sign convention in the sketch). For the key points A, B,C, D shown, indicate whether the position (y), velocity (v), and acceleration (a) are positive, negative, or zero. A: Immediately after the stone leaves Ali's hand. B: The topmost position. C: At the level of Ali's hand on the way down. D: Immediately before the stone hits the ground. +y .....

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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.