Question

three bodies ofmasses m1,m2,m3 are projected simultaneously from high tower.one is vertically upward and other is vertically downward and third one is dropped.accelerstion of centre of mass of the masses till non of the particle reaches the ground is​

Answer 1

If Upward is positive direction,

As we know the acceleration of centre of mass

=> a={m1(-g)+m2(-g)+m3(-g)}/(m1+m2+m3)

=>a=(-g)

i.e. acceleration of centre of mass will be g.