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Rotational Kinematics

AP Physics 1· difficulty 2/5

A wheel slows uniformly from 20 rad/s20~\text{rad/s} to rest in 4 s4~\text{s}. Its angular acceleration is

  • A

    +5 rad/s2+5~\text{rad/s}^2

  • B

    −20 rad/s2-20~\text{rad/s}^2

  • C

    −5 rad/s2-5~\text{rad/s}^2

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  • D

    +80 rad/s2+80~\text{rad/s}^2

Explanation

α=(0−20)/4=−5 rad/s2\alpha = (0 - 20)/4 = -5~\text{rad/s}^2.

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