a) In a frame of reference `S_1`( though the net force is zero, the net acceleration is not zero.
b) In a frame of reference `S_2` though the net force is not zero, the net acceleration is zero.
c) In a frame of reference`S_3` the net acceleration is zero whenever the net force is zero.

Options

A. `S_(1)` and `S_(3)` are inertial and `S_(2)` is non - inertial
B. `S_(1)` and `S_(2)` are non - inertial and `S_(3)` is inertial
C. `S_(1), S_(2), S_(3)` are non - inertial
D. `S_(1), S_(2), S_(3)` are inertial

Answer

B