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Reference Frames and Relative Motion

AP Physics 1· difficulty 2/5

Car A drives east at 25 m/s25~\text{m/s}; car B drives west at 15 m/s15~\text{m/s} on the same road. What is the speed of car A as observed from car B?

  • A

    375 m/s375~\text{m/s}

  • B

    10 m/s10~\text{m/s}

  • C

    40 m/s40~\text{m/s}

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  • D

    20 m/s20~\text{m/s}

Explanation

Relative velocity: vA/B=vA−vB=25−(−15)=40 m/sv_{A/B} = v_A - v_B = 25 - (-15) = 40~\text{m/s} (toward car B).

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