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Q.

The gravitational potential difference between the surface of a planet and a point 10m above the surface is 4J/kg. If the gravitational field is considered uniform, it is found that the work done in moving a mass of 2kg from the surface of the planet to a point 7.5m above the surface is ‘x’ joule. find the value of ‘x’.

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answer is 6.

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Detailed Solution

Since the field is said to be uniform, 

Change in potential with distance  =4J/kg10 

Work done in moving a 2kg mass by 7.5m is

W=2×410×7.5=6J

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