Obtain an expression for the position vector of centre of mass of a system of `n` particles.

Obtain an expression for the position vector of centre of mass of a system n particles in two dimension.

Define centre of mass of a system of particles.

Obtain an expression for the position vector of centre of mass of a two particle system.

What is centre of mass of a body ? Obtain an expression for the positive vector of a centre of mass of two particle system.

Write an expression for the velocity of the centre of mass of a system of particles.

How does centre of mass of a system of particles move ?

Derive an expression for the position vector of the center of mass of particle system.

Write an expression for position vector of centre of mass system of two paraticles lie on x-axis.

Write an expression for the position vector of the centre of mass of n-particle system. Also write the equations of motion which govern the motion of the centre of mass