If the initial internal energy of a system is $U_1$,and it absorbs $450 \ J$ of heat from the surroundings and performs $600 \ J$ of work,what will be the final internal energy of the system?
- A$(U_1 + 150) \ J$
- B$(U_1 + 1050) \ J$
- C$(U_1 - 150) \ J$
- DNone of these
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