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The easy answer to this question is to recognize that some of the potential energy will be lost to work against friction and this loss is simply the force of friction multiplied by the length of the ramp which is 6N. The previous answers I submitted are incorrect.

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Q: A 3.6kg object slides down a a 2 meters long slide inclined at 60 degrees to the horizontal A friction force of 3Newtons acts along the way and gravity is 9.8 calculate potential energy lost?
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