A particle stays at rest as seen in a frame. We can concude that :

If particle stays at rest as seen from a frame of reference

If particle stays at rest as seen from a frame of reference

Statement I: A particle is found to be a rest when seen from a frame S_(1) and moving with a constant velocity when seen from another frame S_(2) . We can say both the frames are inertial. Statement II: All frames moving uniformly with respect to an inertial frame are themselves inertial.

Statement I: A particle is found to be a rest when seen from a frame S_(1) and moving with a constant velocity when seen from another frame S_(2) . We can say both the frames are inertial. Statement II: All frames moving uniformly with respect to an inertial frame are themselves inertial.

(A) : A particle is found to be at rest when seen from a frame S,and moving with a constant velocity when seen from another frame S_2 . We can say both the frames are inertial ( R) : All frames moving uniformly with respect to an inertial frame are themselves inertial