A science student is riding on a flatcar of a train traveling along a strait, horizontal track at a constant speed of 16 m/s. The student throws a ball into the air along a path he judges to make an initial angle of 73° with the horizontal (toward the rear of the car) and to be in line with the track. The student's professor, who is standing on the ground nearby, observes the ball to rise vertically. With what initial speed does the professor see the ball rise? 47.26 m/s 45.28_m/s 40.6_m/s А. D. 43.1_m/s В. Е. 49.59_m/s С. F. 52.33_m/s

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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.