If a man having bag in his hand moves up on a stair . Then Options: A . &nbspthe work done by lifting force is zero B . &nbspthe work done by lifting force is non -zero with respect to ground. C . &nbspthe work done by lifting force is zero with respect to ground D . &nbspthe work done with respectt to ground is same as that of with respect to him.

If a man having bag in

Question

If a man having bag in his hand moves up on a stair . Then

Options:

A . the work done by lifting force is zero

B . the work done by lifting force is non -zero with respect to ground.

C . the work done by lifting force is zero with respect to ground

D . the work done with respectt to ground is same as that of with respect to him.

Answer: Option B

The displacement of bad is in opposition of force of gravity , So work is done by lifting force against gravitational force .

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