A water reservoir contains 108 metric tons of water at an average elevation of 84 m. The maximum amount of electric energy that can be generated from this water is: 8 kwh, 16 kwh, 1630 kwh, 16300 kwh or 58800 kwh.

24.72 kwh

Explanation:

Electric energy=potential energy=mgz where m is mass, g is acceleration due to gravity and z is the elevation.

Substituting the given values while taking g as 9.81 and dividing by 3600 to convert to per hour we obtain

PE = (108*9.81*84) / 3600=24.72 kWh