In your lab on the conservation of total mechanical energy you have a 20.3 gram weight (m m) connected via ?

In your lab on the conservation of total mechanical energy you have a 20.3 gram weight (m m) connected via a string with a 290 gram glider, which glides horizontally with negligible friction as shown above. When you release the m m, it and the glider are accelerated due to the weight of the m m. What is the change in potential energy PE of the m m when the glider moves a distance of 93.0 cm?