C. 4.0Kg
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If the mass of the barrel is 40 kilograms and the barrel is presently on earth, then it weighs 392 newtons (88.2 pounds). What you do with it, what dizzying gyrations you subject it to, or what other objects happen to be nearby, have no effect on its weight.
392 56 x 7 = 392
√392 ~= 19.799
Yes. 19.7989 is the square root of 392. But 392 is not a perfect square.
The LCM is 392.