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What is the gravitational potential ener...

What is the gravitational potential energy of an object located 20,000 m above the earth's surface ?

A

`U=-GMm//( 20km+R_E)`

B

`U=-GMm//(20,000km +R_E)`

C

`U=-GMm//R_E`

D

`U=-GMm//(R_E - 20km)`

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The correct Answer is:
A
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