Help me find the initial acceleration of two particles on a rod?

Question

Two particles(A and B) each of mass 10kg are attached to a massless rod on each on opposite ends of the rod. The rod is placed horizontally on a fulcrum. Particle A is 10 cm away from the fulcrum. And particle B is 70cm away from the fulcrum. The rod is now released. What is the magnitude of the initial acceleration of particles A and B?

Answer 1

g in -j direction