Number 12.5 Please help me

12.5. Two masses m, and m, connected by a massless string of length I are allowed to slide on two fric- tionless inclined planes under the influence of gravity, as shown in Fig. P12.5. Write an expression for the generalized force using (a) I as the generalized coordinate, and (b) {, as the generalized coordinate. Under what conditions will the system be in cquilibrium? Find this position of quilibrium. Y T. m, my Figure P12.5