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Displacement, Velocity, and Acceleration

AP Physics 1· difficulty 3/5

A jogger runs 2.0 km2.0~\text{km} in 400 s400~\text{s}, then walks 0.5 km0.5~\text{km} in 500 s500~\text{s}. What is her average speed for the full trip?

  • A

    2.8 m/s2.8~\text{m/s}

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  • B

    1.6 m/s1.6~\text{m/s}

  • C

    5.0 m/s5.0~\text{m/s}

  • D

    2.5 m/s2.5~\text{m/s}

Explanation

Total distance: 2500 m2500~\text{m}. Total time: 900 s900~\text{s}. vˉ=2500/900≈2.78 m/s\bar v = 2500/900 \approx 2.78~\text{m/s}.

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