A runner jogs 400\text{m} east, then 300\text{m} west, all in 350\text{s}. What is the magnitude of her <strongaverage velocity</strong?

0.29\text{m/s} Net displacement is 400 - 300 = 100\text{m} east, so \bar v = 100/350 \approx 0.29\text{m/s}. (Average <strongspeed</strong would use total distance 700\text{m}.)

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Acemy

Scalars and Vectors in One Dimension

AP Physics 1· difficulty 2/5

400~\text{m}

A
$1.0~\text{m/s}$
B
$0.57~\text{m/s}$
C
$2.0~\text{m/s}$
D
$0.29~\text{m/s}$
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Explanation

400 - 300 = 100~\text{m}

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