Reference Frames and Relative Motion

AP Physics 1· difficulty 3/5

A boat that can move at 5 m/s5~\text{m/s} relative to water aims directly across a river that flows at 3 m/s3~\text{m/s}. The river is 40 m40~\text{m} wide. How far downstream does the boat drift by the time it reaches the other bank?

  • A

    8 m8~\text{m}

  • B

    40 m40~\text{m}

  • C

    24 m24~\text{m}

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  • D

    12 m12~\text{m}

Explanation

Crossing time: 40/5=8 s40/5 = 8~\text{s}. Drift: 3×8=24 m3 \times 8 = 24~\text{m}.

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