At what speed, relative to the frame of the observer making the measurement, is the length of a meter stick 0.60 m?
A)0.80c
B)0.60c
C)0.50c
D)0.70c
E)0.90c

Question

Quizplus · Accepted Answer

The correct answer is A because the length of a meter stick is 0.60 m when it is moving at a speed of 0.80c relative to the frame of the observer making the measurement. This is because the length of an object is contracted in the direction of motion by a factor of sqrt(1 - v^2/c^2), where v is the speed of the object and c is the speed of light.

At What Speed, Relative to the Frame of the Observer