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Displacement, Velocity, and Acceleration

AP Physics 1· difficulty 2/5

A ball thrown straight up from ground level returns to ground after 4.0 s4.0~\text{s}. Using g≈10 m/s2g \approx 10~\text{m/s}^2, what was its initial speed?

  • A

    80 m/s80~\text{m/s}

  • B

    40 m/s40~\text{m/s}

  • C

    20 m/s20~\text{m/s}

    check_circle
  • D

    10 m/s10~\text{m/s}

Explanation

Time up = time down = 2 s2~\text{s}. v0=g(t/2)=(10)(2)=20 m/sv_0 = g(t/2) = (10)(2) = 20~\text{m/s}.

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