Physics

Problem

A runner completes two segments: first she jogs 400 m due east, then immediately 400 m due west, taking a total of 200 s. Which statement about her motion is true? a) Her displacement is

0\,\text{m}

and her average velocity is

4.0\,\text{m\!/s}

east. b) Her displacement is

0\,\text{m}

and her average speed is

4.0\,\text{m\!/s}

. c) Her displacement is

400\,\text{m}

east and her average velocity is

4.0\,\text{m\!/s}

east. d) Her displacement is

0\,\text{m}

and her average speed is

2.0\,\text{m\!/s}

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