Particles (Mass of Each = 0

Multiple Choice

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