To an observer on Earth, the clock on a spaceship moving at constant, but high velocity,would:
A)run slow.
B)run fast.
C)go backwards.
D)stop.

Question

Quizplus · Accepted Answer

According to the theory of relativity, time appears to run slower for an object in motion relative to an observer who is at rest. This effect is known as time dilation. Therefore, the clock on the spaceship would appear to run slow to an observer on Earth. According to the theory of relativity, time appears to run slower in a moving frame of reference relative to a stationary frame of reference. This is known as time dilation. Therefore, the clock on a spaceship moving at a constant, high velocity would appear to run slower to an observer on Earth.

To an Observer on Earth, the Clock on a Spaceship