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Displacement, Velocity, and Acceleration

AP Physics 1· difficulty 1/5

A car drives north at 30 m/s30~\text{m/s} for 20 s20~\text{s}, then turns around and drives south at 30 m/s30~\text{m/s} for another 20 s20~\text{s}. What is the magnitude of the <strong>average velocity</strong> over the full trip?

  • A

    15 m/s15~\text{m/s}

  • B

    30 m/s30~\text{m/s}

  • C

    0 m/s0~\text{m/s}

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  • D

    60 m/s60~\text{m/s}

Explanation

Net displacement is zero (returns to start), so vˉ=0/40=0\bar v = 0/40 = 0. Average <strong>speed</strong> would be 30 m/s30~\text{m/s}.

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