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Rotational Kinematics

AP Physics 1· difficulty 1/5

Starting from rest, a disk undergoes an angular acceleration of 2.0 rad/s22.0~\text{rad/s}^2 for 5.0 s5.0~\text{s}. What is its final angular velocity?

  • A

    0.4 rad/s0.4~\text{rad/s}

  • B

    10 rad/s10~\text{rad/s}

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  • C

    7.0 rad/s7.0~\text{rad/s}

  • D

    2.5 rad/s2.5~\text{rad/s}

Explanation

ω=ω0+αt=0+(2.0)(5.0)=10 rad/s\omega = \omega_0 + \alpha t = 0 + (2.0)(5.0) = 10~\text{rad/s}.

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