Mr. Harding throws a rock straight up into the air. If we assume the upward direction is positive, and ignore air resistance, at the instant the rock leaves Mr Harding's hand (the rock is no longer in contact with Mr. Harding's hand): The acceleration of the rock is downward, and the velocity of the rock is downward The acceleration of the rock is upward, and the velocity of the rock is upward The acceleration of the rock is upward, and the velocity of the rock is downward O The acceleration of the rock is zero, and the velocity of the rock is upward. O The acceleration of the rock is downward, and the velocity of the rock is upward

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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.