Question

If mass of earth decreases by 20% and it's radius increases by 20%, then acceleration due to gravity at the centre of the earth
(1)becomes 9/5 times
(2)becomes 5/9 times
(3)remains same
(4)becomes 3/4 times​

Answer 1

Answer:

g = GM/r^2

M = 80m/100

reduce the earth radius by 20%

so R = 120r/100

g = G(80M/100)/120r/100

g =