Question

Rakesh lifts a heavy book from the floor of the room and puts it in the book shelf of height $2m$. In this process, he takes $5$ seconds. On which of the following does the work done by him depend?

• A. Mass of the book and the time taken to do work
• B. Weight of the book and the height of the book shelf
• C. Height of the book shelf and the time taken to do work
• D. Mass of the book, height of the book shelf and the time taken to do work

Answer 1

The correct option is B Weight of the book and the height of the book shelf

The work done by Rakesh will depend on the weight of the book and the height of the book shelf. This is because Work done = Force $\ast$ displacement which when expanded further is equal to weight of the book into height of the book shelf.( Since Force depends on the weight of the book and displacement is related to the height of the book shelf)