Answer :

Given:

Mass of ball A=20 kg

Mass of ball B=30 kg

Mass of ball C=60 kg

Formula Used:

where

F=Mutual force of attraction between two bodies

G=Universal Gravitational Constant=6.67×10^{-11} Nm^{2}/kg^{2}

M=Mass of one body

m=Mass of other body

r=Distance between the bodies

Tip: We have to consider two attracting bodies at a time to calculate the mutual force between them.

For A and B,

For B and C,

For C and A,

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