question_answer

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

A) g decreases by 2% and K decreases by 4%

B) g decreases by 4% and K increases by 2%

C) g increases by 4% and K decreases by 4%

D) g decreases by 4% and K increases by 4%