Question

the amount of work done is lifting a body of mass m from the surface of the earth to a height equal to twice the radius of the earth is

Answer 1

hey mate here is your answer

here the angle between force and displacement is 90

so

work done=FScos theta

so work done =FS cos 90

work done = 0J

hope it will help you

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Answer 2

Explanation:

At earth surface

Ui = -Gmm / R

at the height h

Uf = -Gmm /2R

Therefore work done = Uf -Ui

                                     =  Gmm/R   = mgR /2

              Hope you understand

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