Question

iagara Falls is a set of very large waterfalls located on the border between New York and Ontario, Canada. Over 200,000 cubic feet of fast-moving water falls approximately 180 feet every second. Water at the top of the Falls possesses

Answer 1

Water at the top of Iagara Falls possesses gravitational potential energy
because of its height, and kinetic energy because of its motion. 

A lot of this energy is tapped off of the stream as the water falls, and is
used to generate electrical energy.

180-ft = about 54.9 meters

1 kilogram (1 liter) of water loses about

                     (1 kg) x (9.8 m/s²) x (54.9 m)

                 =      about 538 joules of potential energy,
                         while falling from the top of Iagara Falls
                         to the pool at the bottom.