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Displacement, Velocity, and Acceleration

AP Physics 1· difficulty 2/5

On Mars (g≈3.7 m/s2g \approx 3.7~\text{m/s}^2), a rock is dropped from rest and falls 7.4 m7.4~\text{m}. What is its impact speed?

  • A

    5.4 m/s5.4~\text{m/s}

  • B

    3.7 m/s3.7~\text{m/s}

  • C

    15 m/s15~\text{m/s}

  • D

    7.4 m/s7.4~\text{m/s}

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Explanation

v=2gh=2(3.7)(7.4)=54.76≈7.4 m/sv = \sqrt{2 g h} = \sqrt{2(3.7)(7.4)} = \sqrt{54.76} \approx 7.4~\text{m/s}.

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