A really high-speed train moves in a direction parallel to its length with a speed that approaches the speed of light.The length of the train,as measured by a stationary observer on the ground,
A)approaches infinity.
B)increases due to the motion.
C)decreases due to the motion.
D)is not affected by the motion.

Question

Quizplus · Accepted Answer

According to the theory of relativity, as an object moves closer to the speed of light, its length appears to shrink in the direction of motion. This effect is known as length contraction. Therefore, the length of the train, as measured by a stationary observer on the ground, will decrease due to the motion.

A Really High-Speed Train Moves in a Direction Parallel to Its