The unit of energy is:

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(B) Energy is defined as the product of power and time. Since $	ext{Power} = 	ext{Energy} / 	ext{Time}$,it follows that $	ext{Energy} = 	ext{Powe

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$	ext{Watt} \cdot 	ext{day}$

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(B) Energy is defined as the product of power and time. Since $	ext{Power} = 	ext{Energy} / 	ext{Time}$,it follows that $	ext{Energy} = 	ext{Power} 	imes 	ext{Time}$. Given that the unit of power is $	ext{Watt}$ and the unit of time is $	ext{day}$,the product $	ext{Watt} \cdot 	ext{day}$ represents a unit of energy. Option $A$ $(J/	ext{sec})$ is a unit of power. Option $C$ $(	ext{Kilowatt})$ is a unit of power. Option $D$ $(	ext{gm} \cdot 	ext{cm}/	ext{sec}^2)$ is a unit of force (dyne). Therefore,the correct option is $B$.

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