4. Two men, Joel and Jerry, push against a car that has stalled, trying unsuccessfully to get it moving. Jerry stops after 10 min., while Joel is able to push for 5.0 min. longer. Compare the work they do on the car. * a. Joel does 75% more work than Jerry b. Joel does 50% more work than Jerry c. Joel does 25% more work than Jerry d. Neither Joel nor Jerry does any work.

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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.