A cord is used to lower vertically a block of mass M a distance d at a constant downward acceleration of g/4. Then the work done by the cord on the block is:

A cord is used to lower vertically a block of mass M a distance d at a

1.	A cord is used to lower vertically a block of mass M a distance d at a constant downward acceleration of g/4. Then the work done by the cord on the block is:
A.	\[Mgd/4\]
B.	\[3\,Mgd/4\]
C.	\[-\,3\,Mgd/4\]
D.	\[Mgd\]
Answer» D. \[Mgd\]

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A cord is used to lower vertically a block of mass M a distance d at a constant downward acceleration of g/4. Then the work done by the cord on the block is:

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