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In case a) three times
In case b) four times
In case c) nine times
In case d) no change
Explanation:
we know that force is directly proportional to the square of increase of mass in each of two body .
If mass of ONE body is trippled ,
then force will be trippled .
If mass of BOTH is trippled , then the force will be nine times .
If one objects mass is trippled and other is reduced of one-third , then there will be no change .
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