A 6 kg object moves vertically up a distance of 7 meters. Its potential energy changed by....
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A 6 kg object moves vertically up a distance of 7 meters. Its potential energy changed by....

[From: ] [author: ] [Date: 11-12-20] [Hit: ]
-C.It has decreased by 411.......
Having some trouble with this one...

A. It has increased by 411.6 J
B. It has decreased by 42 J
C. It has decreased by 411.6 J
D. It has increased by 42 J

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6*9.81*7=412.02 J
6*9.8*7=411.6 J answer A assuming the chosen reference level for PE is below the object; otherwise it could be C i.e. magnitude has decreased; although even with this reference level, the change would be in the positive direction.

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PE = mgh = (6)(9.8)(7) = 411.6 J (increase)
what could be simplier?

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C.It has decreased by 411.6J
1
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