Charged capacitors connected with opposite polarity

A capacitor $C_1=2.0\mu \mathrm{F}$ is charged to $60\mathrm{V}$ and a capacitor $C_2=3.0\mu \mathrm{F}$ is charged to $20\mathrm{V}$. Both are disconnected from the sources and connected by joining the positive plate of each with the negative plate of the other. Compute the final potential difference and the energy dissipated in the connection.