Particles (mass of each = 0.20 kg) are placed at the 40-cm and 100-cm marks of a meter stick of negligible mass. This rigid body is free to rotate about a frictionless pivot at the 0-cm end. The body is released from rest in the horizontal position. What is the initial angular acceleration of the body?
A. 12 rad/s2
B. 5.9 rad/s2
C. 8.4 rad/s2
D. 5.4 rad/s2
E. 17 rad/s2
Answer: A
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