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What is centre of mass of a body ? Obtai...

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

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The point at which the entire of the particles appears to be concentrated is called the centre of mass. Centre of mass lies at the geometric centre.
`X=(m_1 x_1+m_2 x_2)/(m_1+m_2)`
Note : For n particles (discrete)
`X=(underset(i_i)overset(n)(sum)m_i R_i)/(underset(i=I)overset(n)(sum)m_i)and sum m_i=M=` mass of the whole body.
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