The armature (or spinning portion) of a motor is accelerated uniformly from rest to a rotational velocity of 1500 rev/min in 10 seconds. The rotational acceleration of the motor is
A. 150 rad/s2.
B. zero.
C. 31.4 rad/s2.
D. 15.7 rad/s2.
E. 75 rad/s2.
Answer: D
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