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(B) The work done $(W)$ by an external force in lifting an object against gravity is given by the formula: $W = mgh$.Here,$m$ is the mass of the objec

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Weight of the book and height of the bookshelf

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(B) The work done $(W)$ by an external force in lifting an object against gravity is given by the formula: $W = mgh$.Here,$m$ is the mass of the object,$g$ is the acceleration due to gravity,and $h$ is the vertical displacement (height).Since the weight of the book is $W_b = mg$,the work done can be expressed as $W = W_b 	imes h$.Therefore,the work done depends only on the weight of the book and the height of the bookshelf.It does not depend on the time taken to perform the work,as time is a factor in calculating power,not work.

You lift a heavy book from the floor of the room and keep it in the bookshelf having a height of $2 \, m$. In this process,you take $5 \, s$. The work done by you will depend upon:

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