If resultant of forces acting on a system is zero then

Options

A. Work done by each force must be zero .
B. Total work done by all forces must be zero .
C. Total work done by all the forces may be non - zero
D. Kinetic energy of the system must remain constant .

Answer

C

Explanation

When resultant of all thef forces acting on a system is zero then it does not imply that total work done may zero or non - zero . In fact total work may be zero or non - zero and thus kinetic energy of the system may or may not change .