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
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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 =
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