Answer: A.
Q = +50 J, W = -50 J
Explanation:
According to first law of thermodynamics, which can be expressed as;
dU = Q - W
Where
dU = change in internal energy
Q = added heat
W = work done by the system
If W is positive, work is done on the system. And if Q is negative, the system loses heat to the surrounding.
In the question above, the situation that would cause the greatest increase in the motion of molecules in a system will be option A
Q = +50 J, W = -50 J
Since the system gained heat and work is been done by the system.
