Question $2$: Application

You are given that$,($that is$,),,,$ and that the capacitor has already charged such that$$flows through$$Switch $1.$

Switch $1$is opened and$$Switch $2$is closed after which a mass,$,$ of$$is raised to a final height of$.$

What is the efficiency,$,$ of the motor$/$pulley$/$mass system?

If needed, you may assume a gravitational acceleration of $9\mathrm{.}80$m$/$s$2.$