Particles (Mass of Each = 0

Multiple Choice

Particles (mass of each = 0.40 kg) are placed at the 60-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 magnitude of the initial linear acceleration of the end of the body opposite the pivot?

A) 15 m/s²
B) 9.8 m/s²
C) 5.8 m/s²
D) 12 m/s²
E) 4.7 m/s²