Question

Which scenario best describes an object with a displacement of zero?

A train moves uphill as it travels in a straight path.
A person walks 2 miles north and 2 miles west.
A ball rolls from the top to the bottom of a hill.
A race car starts and ends at the same point on a track.

Answer 1

"A race car starts and ends at the same point on a track."

Displacement is the vector from the starting position to the final position. If start = end, that vector is zero even though the distance traveled may be nonzero.