Which of the following graphs could represent, to the same scale, the force exerted by the scale on each ball as a function of time? Select an answer for the rubber ball and an answer for the clay ball. F (N) F (N) A) O F (N) 7 (s) D) F (N) 1 (s) в) F (N) 1 (s) E) rubber ball: C) 7 (s) clay ball:

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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.