Question

Particles of masses 2M, m and M are respectively at points A, B and C with $AB=\frac{1}{2}(BC)$.m is much-much smaller than M and at time t = 0, they are all at rest as given in figure. At subsequent times before any collision takes place.(a) m will remain at rest(b) m will move towards M(c) m will move towards 2M(d) m will have oscillatory motion

Answer 1

(c) The particle m at B will move towards A with the greater force, due to particle 2M at A.

Force on m at B due to 2M at A is