Let g be the acceleration due to gravity at the earth's surface and K the rotational kinetic energy of the earth. Suppose the earth's radius decreases by 2%. Keeping all other quantities constant, then

Options

A. g decreases by 2% and K.E. decreases by 4%
B. g decreases by 4% and K.E. increases by 2%
C. g increases by 4% and K.E. increases by 4%
D. g decreases by 4% and K.E. increases by 4%

Answer

C