Imagine that you are holding a heavy box (about 15kg) and walking slowly on a horizontal floor over a distance...
Imagine that you are holding a heavy box (about 15kg) and walking slowly on a horizontal floor over a distance of 5m. The work you do on the box is about:
a)75J
b)750J
c)0J
d)150J
The answer is (c) but why?
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