A CD with a Diameter of 12

A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.00 rad/sec² acquires an angular velocity of 5.00 rad/sec.The CD continues rotating at 5.00 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration.What is the total acceleration of a point 4.00 cm from the center at the time 2.00 seconds from the start?

A) 0.450 m/s²
B) 0.314 m/s²
C) 0.215 m/s²
D) 0.165 m/s²
E) 0.100 m/s²

Correct Answer:

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