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

Options

A. the frame is inertial
B. resultant force on the particle is zero
C. the frame may be inertical but resultant force on the particle is zero
D. the frame may be non-inertial but there is a non zero resultant force

Answer

c,d

Explanation

particle will be seen at rest only when frame is inertial and resultant force on particle is zero Also if frame is non inertial (accelerated) the particle must also possess the same acc in magnitude and direcction resultant force on the particle must be non zero .