Rotational Kinematics

AP Physics 1· difficulty 3/5

A wheel slows uniformly from 20 rad/s20~\text{rad/s} to rest in 4 s4~\text{s}. Total angular displacement?

  • A

    10 rad10~\text{rad}

  • B

    20 rad20~\text{rad}

  • C

    80 rad80~\text{rad}

  • D

    40 rad40~\text{rad}

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Explanation

Average ωˉ=10\bar\omega = 10, displacement =ωˉt=40 rad= \bar\omega t = 40~\text{rad}.

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