One end of a light rope is tied directly to the ceiling. A man of mass $M$ initially at rest on the ground starts climbing the rope upto a height $l$ . From the time he starts at rest on the ground to the time he is hanging at rest at a height $l$ , how much work was done on the man by the rope?

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M g l

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- M g l

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It depends on how fast the man goes up.

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Solution

The correct option is B $M g l$
Work done by rope is $T l$

As person is moving slowly $T = m g$

$\Rightarrow$ Work done by string $= M g l$

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Q. One end of a light rope is tied directly to the ceiling. A man of mass

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One end of a light rope is tied directly to the ceiling. A man of mass M initially at rest on the ground starts climbing the rope upto a height l. From the time he starts at rest on the ground to the time he is hanging at rest at a height l, how much work was done on the man by the rope?

The correct option is B MglWork done by rope is Tl As person is moving slowly T=mg ⇒ Work done by string =Mgl

One end of a light rope is tied directly to the ceiling. A man of mass $M$ initially at rest on the ground starts climbing the rope upto a height $l$ . From the time he starts at rest on the ground to the time he is hanging at rest at a height $l$ , how much work was done on the man by the rope?

The correct option is B $M g l$
Work done by rope is $T l$

As person is moving slowly $T = m g$

$\Rightarrow$ Work done by string $= M g l$