(Solved): A 4.0kg block and a 5.0kg block are connected vertically by a 0.6kg rod as shown in the figu ...

A $$4.0\mathrm{kg}$$ block and a $$5.0\mathrm{kg}$$ block are connected vertically by a $$0.6\mathrm{kg}$$ rod as shown in the figure below. The links between the blocks and the rod are denoted by $$B$$ and $$A$$. A force $$F$$ is applied to the upper block. In the figure above, the blocks and rod assembly move downward at $$2\mathrm{m}/{\mathrm{s}}^2$$ accelleration. The applied force $$F$$ is closest to: A. $$75\mathrm{N}$$ B. $$90\mathrm{N}$$ C. $$92\mathrm{N}$$ D. $$94\mathrm{N}$$ E. $$96\mathrm{N}$$