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A system absorbs `20kJ` heat and also does `10kJ` of work. The net internal enegry of the system

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A system absorbs `20kJ` heat and also does `10kJ` of work. The net internal enegry of the system
A. Increases by `10kJ`
B. Decreases by `10kJ`
C. Increases by `30 kJ`
D. Decreases by `30kJ`
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`DeltaU = q +w = 20 - 10 = 10 kJ`
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