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How much work is required to hold a 2kg book 2m above the ground?
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21 votes
21 votes
How much work is required to hold a 2kg book 2m above the ground?

How much work is required to hold a 2kg book 2m above the ground?-example-1
User Mickers
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1 Answer

23 votes
23 votes

Given that the mass of the book is m = 2kg.

The height of the book from the ground is h = 2 m.

We have to find the work done.

The formula to calculate work done is


\begin{gathered} W\text{ = Potential energy} \\ =\text{mgh} \end{gathered}

Here, g =9.8 m/s^2 is the acceleration due to gravity.

Substituting the values, the work done will be


\begin{gathered} W=\text{ 2}*9.8*2 \\ =39.2\text{ J} \end{gathered}

Thus, the work done will be 39.2 J.

User Hamza Zafar
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3.0k points
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