A) Work depends on reference frame.
B) Net work done on the system by tension acting within a system will be zero.
C) Net work done on the system by kinetic friction acting within the system will be zero
D) Net work done on the system by all the internal and external forces is equal to change in its kinetic energy.
Correct Answer: C
Solution :
\[W=\vec{F}.\vec{S}\] and depends on reference frame because displacement depends on reference frame. kinetic friction always produce heat and decrease energy of the system hence its net work done always negative for system when it is present inside system.
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