MCQ
A system of particles is called a rigid body when:
- AAny two of particles of system may have displacements in opposite directions under action of a force.
- BAny two of particles of system may have velocities in opposite directions under action of a force.
- CAny two particles of system may have a non-zero relative velocity.
- DAny two of particles of system may have displacements in same direction under action of a force.


