David H. answered • 01/17/17

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You can consider the force of gravity as a constant. The work done by gravity is then W = Fs where s is the displacement in the direction of the force of gravity.

So what is the force of gravity F?

What is s? Remember you are on an incline so it is not 12 feet exactly. Draw a triangle if you have to.

Hope this is helpful.

Best - David