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tamir102
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Homework Statement
The highest waterfall in Canada is the Della Falls in British Columbia, with a change
in elevation of 4.4 102 m. When the water has fallen 12% of its way to the bottom,
its speed is 33 m/s. Neglecting air resistance and fluid friction, determine the speed
of the water at the top of the waterfall.
Homework Equations
E before = E after
1/2 mv^2 + mgh = 1/2 mv^2 + mgh
v^2 + 2gh = v^2 + 2gh
v^2 = v^2 + 2gh - 2gh
v = √v^2 + 2gh - 2gh
The Attempt at a Solution
GIVENS:
waterfall distance from ground = 440m
V2= 33m/s
water fallen at 12% distance = 387.2m
v = √v^2 + 2gh - 2gh
v = √(33m/s)^2 + 2(9.8 m/s^2)(387.2m) - 2(9.8 m/s^2)(440m)
v=7.35m/s
now the answer in the book is 5.0m/s and i was wondering what is the mistake that is made ?? or is the book just incorrect?
thank you for your help in advance..