Reference Frames and Relative Motion

AP Physics 1· difficulty 2/5

Two cars travel in the same direction. Car A is at 25 m/s25~\text{m/s}, car B is 40 m40~\text{m} ahead at 20 m/s20~\text{m/s}. How long until A catches B?

  • A

    2 s2~\text{s}

  • B

    5 s5~\text{s}

  • C

    8 s8~\text{s}

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  • D

    10 s10~\text{s}

Explanation

Closing speed 5 m/s5~\text{m/s}. Time = 40/5=8 s40/5 = 8~\text{s}.

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