The centre of mass of a body is a point at which the entire mass of the body is supposed to be concentrated. The position vector `overset rarr(r )` of c.m of the system of tow particles of masses `m_(1)` and `m_(2)` with position vectors `overset rarr(r_(1))` and `overset rarr(r_(2))` is given by
`overset rarr(r ) = (m_(1)overset rarr(r_(1)) + m_(2)overset rarr(r_(2)))/(m_(1) + m_(2))`
For an isolated system, where no external force is acting, `overset rarr(v_(cm)) =` constant
Under no circumstances, the velocity of centre of mass of an isolated system can undergo a change
With the help of the comprehension given above, choose the most appropriate alternative for each of the following questions :
A bomb dropped from an aeroplane in level flight explodes in the middle. the centre of mass of the fragments

Options

A. is a rest
B. moves vertically downwards
C. moves vertically upwards
D. continues to follow the same parabolic path which it would have followed if there was no exposion.

Answer

D

Explanation

As explosion is due to inertal forces only, the centre of mass of fragments continues to follow the same parabolic path, which it would have followed, if there was no explosion.