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If a body of mass m is moved from the earth surface at height ‘h’ above the earth work done against gravity. When (h<<<R) here R is radius of earth.

Option: 1

-mgR

 


Option: 2

-mgh

 


Option: 3

mgR

 


Option: 4

mgh


Answers (1)

best_answer

As we learn

Work done against gravity when 'h' is very small -

W=\frac{mgh}{1+\frac{h}{R}}

W=mgh

W= work done

h\rightarrow height

- wherein

\frac{h}{R}\rightarrow 0

h is small as compared to earth

 

 Work done against gravity

w = \frac{mgh}{1 + \frac{h}{R_{e}}}

if h<<<<Re 

\frac{h}{R_{e}} <<<<<1

hence w = mgh

 

 

Posted by

chirag

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