7-49(b).A river is flowing with a speed of 3.74
m/s just upstream from a waterfall of vertical height 8.74 m. During
second 7.12X104 kg of water pass over the fall.
(a) [We will ignore this part]
(b) If there is complete conversion of
potential energy to kinetic energy, what is the speed of the water at
bottom of the fall?
(Note: This is actually an unrealistic assumption;
some of the energy in the fall will be converted into heat)
No. It is at a height above the bottom so it has