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If the unit of length and force be increased four times, then the unit of energy is

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If the unit of length and force be increased four times, then the unit of energy is

(A) increased 4 times. 

(B) increased 8 times. 

(C) increased 16 times. 

(D) decreased 16 times.

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Answer is (C) increased 16 times.

Energy = force x distance, so if both are increased by 4 times then energy will increase by 16 times.

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