The height of a certain waterfall is 33.3 m. When the water reaches the bottom of the falls, its speed is 25.8

Question

The height of a certain waterfall is 33.3 m. When the water reaches the bottom of the falls, its speed is 25.8 m/s. Neglecting air resistance, what is the speed of the water at the top of the falls?

Answer 1

Using energy of a single molecule of water of mass m
.5*m*25.8^2=.5*m*v0^2+m*9.81*33.3
solve for v0
v0=3.506 that's the speed.

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