Physics

Problem

A runner starts at the

40\,\text{m}

mark on a straight track and finishes at the

10\,\text{m}

mark. The positive

x

-axis points toward the east. Which of the following best describes the runner’s displacement? a)

\phantom{-}30\,\text{m}

, toward the east b)

-30\,\text{m}

, toward the east c)

-30\,\text{m}

, toward the west d)

\phantom{-}30\,\text{m}

, toward the west