Question

Two objects $P$ and $Q$ initially at rest move towards each other under mutual force of attraction. At the instant when the velocity of $P$ is $v$ and that of $Q$ is $2v$, the velocity of centre of mass of the system is

• A. $v$
• B. $3v$
• C. $2v$
• D. $1.5v$
• E. Zero

Answer 1

The correct option is E Zero

Since, they move due to mutual interaction between two objects so, centre of mass remains same and its velocity is zero.