An object moving at a relativistic speed past a stationary observer appears to
A) have length expanded and have a faster clock.
B) have length contracted and have a faster clock.
C) have length expanded and have a slower clock.
D) have length contracted and have a slower clock.
E) be completely normal.

Question

Quizplus · Accepted Answer

According to the theory of relativity, an object moving at a relativistic speed (close to the speed of light) relative to a stationary observer will appear to have its length contracted (Lorentz contraction) and its clock running slower (time dilation).

An Object Moving at a Relativistic Speed Past a Stationary