23.
A rope of length 1 and mass 'm' is connected to a chain of length 1 and mass 2m vertically as shown in figure. What is the change in gravitational potential energy if the system is inverted and hung from same point.
(A) mgl
(B) 4mgl
(C)3mgl
(D) 2mgl
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Answer:the ans is option d)2mgl
Explanation:
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