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Question

Which of the following is a unit of energy?

A
Joule
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B
kg-m/sec
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C
N-m
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D
W-s
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Solution

The correct option is C N-m
Energy=power×time
The SI unit of energy is joule.
The SI unit of power is watt.
According to above formula the unit of energy is given by, W-s
Now, work is equal to the energy and
Work=force×displacement
Hence, unit of energy also given as N-m

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