When 20 J of work was done on a gas, 40J of heat energy was released. If the initial internal energyof the gas was 70J, what is the final internal energy?

When 20 J of work was done on a gas, 40J of heat energy was released.

1.	When 20 J of work was done on a gas, 40J of heat energy was released. If the initial internal energyof the gas was 70J, what is the final internal energy?
Answer» 50 J 60 J 90 J 110 J Answer :A