1.

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​

Answer»

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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