Choose the correct statement(s): (A) Total work done by internal forces of a system on the syste...

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Choose the correct statement(s):
(A) Total work done by internal forces of a system on the system is always zero.
(B) Total work done by internal forces of a system on the system is sometimes zero.
(C) Total work done by internal forces acting between the particles of a rigid body is always zero.
(D) Total work done by internal forces acting between the particles of a rigid body is sometimes zero.
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