The work done in lifting a body of mass "m" to height equal to radius of the earth is
The work done in lifting a body of mass "m" to height equal to radius of the earth is
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Work done is displacement times the force applied on that object.
Mass= m
force = m*g = mg
radius of the earth is roughly 6400 km = 640000 m
costheta =cos 90 = 0
that means WORK DONE = Fs*costheta = mg*640000* cos90
= ZERO