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Displacement, Velocity, and Acceleration

AP Physics 1· difficulty 2/5

A ball dropped from rest takes 2.5 s2.5~\text{s} to hit the ground. Using g≈10 m/s2g \approx 10~\text{m/s}^2, from what height was it released?

  • A

    31.25 m31.25~\text{m}

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  • B

    12.5 m12.5~\text{m}

  • C

    25 m25~\text{m}

  • D

    62.5 m62.5~\text{m}

Explanation

h=12gt2=12(10)(6.25)=31.25 mh = \tfrac{1}{2}g t^2 = \tfrac{1}{2}(10)(6.25) = 31.25~\text{m}.

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