Potential Energy On Incline

A ball with a mass of 1.0 kg sits at the top of a 30o incline plane that is 20.0 meters long. If the potential energy of the ball is 98 J at the top of the incline, what is the potential energy once it rolls half way down the incline?

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Since the height is decreasing, the Ep is decreasing and must have a value less than its initial reading 98 J. D is eliminated because its value is higher than the initial Ep value. C is eliminated because its value is the same as the initial value of the Ep. A is eliminated because the only way to have zero Ep is if the body is at ground level. That leaves B as the only option.

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