A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is
A. -140 kJ
B. -80 kJ
C. -40 kJ
D. +60 kJ
Answer: Option D
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q=u+w
1 case
100=u+60
u=40.
as u is a point function it will remain same
2 case
q=u+w
q=40+20
q=+60KJ.
How please explain