Problem 1.81

Prism $l$ of mass $m_{1}$ and with angle $\alpha$ (see Fig. 1.23) rests on a horizontal surface. Bar 2 of mass $m_{2}$ is placed on the prism. Assuming the friction to be negligible, find the acceleration of the prism.

w=g \sin \alpha \cos \alpha /\left(\sin ^{2} \alpha+m_{1} / m_{2}\right)

The Fundamental Equation of Dynamics