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Displacement, Velocity, and Acceleration

AP Physics 1· difficulty 1/5

A rock is dropped from rest. After how long is its speed 30 m/s30~\text{m/s}? (Use g≈10 m/s2g \approx 10~\text{m/s}^2.)

  • A

    5 s5~\text{s}

  • B

    3 s3~\text{s}

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  • C

    2 s2~\text{s}

  • D

    1 s1~\text{s}

Explanation

t=v/g=30/10=3 st = v/g = 30/10 = 3~\text{s}.

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