Home
Class 11
PHYSICS
10 Two particles of masses m(1) and m(2)...

10 Two particles of masses `m_(1)` and `m_(2)` initially at rest start moving towards each other under their mutual force of attraction. The speed of the centre of mass at any time t, when they are at a distance r apart, is

A

Zero

B

`(G (m_(1) m_(2))/(r^(2)).(1)/(m_(1)))t`

C

`(G (m_(1)m_(2))/(r^(2)).(1)/(m_(2)))t`

D

`(G(m_(1)m_(2))/(r^(2)).(1)/(m_(1) + m_(2)))t`

Text Solution

Verified by Experts

The correct Answer is:
A
Centre of mass is at rest initially and no external force is applied hence COM will remain at rest.
Promotional Banner

Similar Questions

Explore conceptually related problems

Two bodies initially at rest, started moving towards each other due to mutual attraction. Which of the following is incorrect ?

Two particles of mass m_(1) and m_(2) are approaching towards each other under their mutual gravitational field. If the speed of the particle is v, the speed of the center of mass of the system is equal to :

Two particles of masses 4kg and 6kg are separated by a distance of 20cm and are moving towards each other under mutual force of attraction, the position of the point where they meet is

Two particles A and B initially at rest, move towards each other, under mutual force of attraction. At an instance when the speed of A is v and speed of B is 2v , the speed of centre of mass ( CM ) is

Two paricle A and B initially at rest, move towards each other under mutual force of attraction. At the instant when the speed of A is V and the speed of B is 2V, the speed of the centre of mass of the system is

Two particles of masses m_(1) and m_(2) are initially at rest infinite distance apart. If they approach each other under inverse square law of force (F=k//r^(2)) find their speed of approach at the instant when they are distance d apart.

Two particles of mass M and 2M are at a distance D apart. Under their mutual force of attraction they start moving towards each other. The acceleration of their centre of mass when they are D/2 apart is :

Two particles A and B initially at rest, move towards each other by mutual force of attraction. At the instant when the speed of A is n and the speed of B is 3n , the speed of the centre of mass of the system is