Q 1 :    

In a system, two particles of masses $m_1=3$ kg and $m_2=2$ kg are placed at a certain distance from each other. The particle of mass $m_1$is moved towards the center of mass of the system through a distance of 2 cm. In order to keep the center of mass of the system at the original position, the particle of mass $m_2$ should move towards the center of mass by the distance ___ cm.               [2024]