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I am having a difficult time trying to figure out why my book says that I should solve for v by:

(1) Set the kinetic energy equal to the change in potential energy and solve for v

Then 3 problems later it says solve for v by:

(2)Set ΔK = −ΔU and solve for v

http://img593.imageshack.us/img593/1995/1idz.jpg [Broken]

I just need to know why they are using different equations to solve for v.. this is not making any sense.

(1) Set the kinetic energy equal to the change in potential energy and solve for v

Then 3 problems later it says solve for v by:

(2)Set ΔK = −ΔU and solve for v

http://img593.imageshack.us/img593/1995/1idz.jpg [Broken]

I just need to know why they are using different equations to solve for v.. this is not making any sense.

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