When \( 20 \mathrm{~J} \) of work was done on a gas, \( 40 \mathrm{...

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When \( 20 \mathrm{~J} \) of work was done on a gas, \( 40 \mathrm{~J} \) of heat energy
\( \mathrm{P} \) was released. If the initial internal energy of the gas was \( 70 \mathrm{~J} \),

W what is the final internal energy?
(A) \( 50 \mathrm{~J} \)
(B) \( 60 \mathrm{~J} \)
(C) \( 90 \mathrm{~J} \)
(D) \( 110 \mathrm{~J} \)
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