Particles of masses 2M, m and M are respectively at points A, B and C with AB = ½ (BC). m is much-much smaller than M and at time t = 0, they are all at rest (Fig. 8.1).
At subsequent times before any collision takes place:
1
m will remain at rest.
2
m will move towards M.
3
m will move towards 2M.
4
m will have oscillatory motion.