physics
posted by ashley  on .
If an observer is traveling parallel to a rod at twice the speed of the rod, what is does the observer perceive the length to be?
Choose one answer.
a. The length of the rod remains the same.
b. The length of the rod will become twice its original value.
c. The length of the rod will become half of the original value.
d. The length of the rod will decrease.

d.