The angular velocity of a rotating disc decreases uniformly from to in

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Torque and Rotational Dynamics · Torque and Rotational Dynamics

Problem

The angular velocity of a rotating disc decreases uniformly from

20\,\text{rad s}^{-1}

4\,\text{rad s}^{-1}

4\,\text{s}

. What is its angular acceleration during this interval? (a)

+4\,\text{rad s}^{-2}

(b)

-5\,\text{rad s}^{-2}

(c)

-4\,\text{rad s}^{-2}

(d)

+6\,\text{rad s}^{-2}