Two objects of masses m and 4m are at rest at infinite

Last updated: 6/24/2023

Two objects of masses m and 4m are at rest at infinite separation They move towards each other under mutual gravitational attraction Then at a separation r which of the following is true A The total kinetic energy of the system is not zero B The force between them is not zero C The centre of mass of the system is at rest D All the above are true