Two sphere of mass 2M and M are initially at rest at a distance R apart. Due to mutual force of attraction they approach each other. When they are at separation `(R )/(2)`, the acceleration of their centre of mass is ……….

Options

A. `0(m)/(s^(2))`
B. `g""(m)/(s^(2))`
C. `3g""(m)/(s^(2))`
D. `12g""(m)/(s^(2))`

Answer

A

Explanation

Initially acceleration is zero, hence it remains zero because the external force on system does not acting.