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Gravitational potential difference between surfaceof a planet and a point situated at a height of 20mabove its surface is 2 J/kg. If gravitational field isuniform, then the work done in taking a 5kg bodyupto height 4 meter above surface will be :(1) 2 J (2) 20 J (3) 40 J (4) 10 J |
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Answer» The potential DIFFERENCE for a distance of 20m is 2 joule/kg. Now work DONE =m× potential difference. Thus work done for a distance of 4M for a MASS 5kg, W= 20 4
×2×5 ⟹W=2J |
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