Question

A body has weight (W) on the ground. The work which must be done to lift it to a height equal to the radius of the earth, R, is

• A. equal to W $\times$ R
• B. greater than W $\times$ R
• C. less than W $\times$ R
• D. Cannot be determined
  

Answer 1

The correct option is C less than W $\times$ R

If acceleration due to gravity was constant, constant force W was to be applied.
However, due to the decrease in g we need to apply less force as we go higher.
Hence the work done is lesser.