How many more joules of gravitational potential energy arethere for each kilogra

Question

How many more joules of gravitational potential energy arethere for each kilogram of water at the top of this waterfallcompared with each kilogram of water at the foot of thefalls? Find the kinetic energy and speed of each kilogram of water asit reaches the base of the waterfall, assuming that there are nolosses due to friction with the air or rocks and that the mass ofwater had negligible vertical speed at the top. How high would Yosemite Falls have to be so that each kilogramof water at the base had twice the kinetic energy you found in partB? How high would Yosemite Falls have to be so that each kilogramof water at the base had twice the speed you found in part C? Please help I don't even know where to start!

Explanation / Answer

First, you have h = 2425 ft = 739.14 m and m = 1 kg.

a.)

PEi = U = mgh; PEf = 0

PEi = (1)(9.8)(739.14) = 7243.572 J

PEi ? 7.243 * 103 J

PEi

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