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14x10^3 Joule Is Answer. Efficiency = Output*100/input. So input = (5.85*10^3)*100/42

 

Answer
We know efficiency can be defined as e=output/input =5.85*10³/input 0.42=5.84*10³/input So, Input=5.84*10³/0.42 =13.9*10³ =1.39*10⁴j

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