A CD with a Diameter Of $12.0 \mathrm{~cm}$ Starts from Rest and with a Constant Angular Acceleration Of Rest

Multiple Choice

A CD with a diameter of $12.0 \mathrm{~cm}$ starts from rest and with a constant angular acceleration of $1.0 \mathrm{rad} / \mathrm{sec}^{2}$ acquires an angular velocity of $5.0 \mathrm{rad} / \mathrm{sec}$ . The CD continues rotating at $5.0 \mathrm{rad} / \mathrm{sec}$ for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular acceleration. What is the radial acceleration of a point $4.0 \mathrm{~cm}$ from the center at the time 2.0 seconds from the start?

A) $0.21 \mathrm{~m} / \mathrm{s}^{2}$
B) $0.28 \mathrm{~m} / \mathrm{s}^{2}$
C) $0.30 \mathrm{~m} / \mathrm{s}^{2}$
D) $0.37 \mathrm{~m} / \mathrm{s}^{2}$
E) $0.16 \mathrm{~m} / \mathrm{s}^{2}$