Question

epraghna.com/student/e
The amount of work done in lifting a body of
mass 'm' from the surface of the earth to
height equal to thrice the radius of the earth is
(A)
3GMm
4R
(B)
3G Mm
2R​

Answer 1

Explanation:

since to calculate work done the formula is =mgh

therefore =m×GM/r^2×3r

=3GMm/r