Conservation Of Energy

Let third mass particle moves making angle with X-axis.
The horizontal component of velocity of mass particle =
And vertical component =
From conservation of linear momentum in X-direction
or
or ....(i)
Again, applying law of conservation of linear momentum in Y-direction

or ....(ii)
Squaring Eqs. (i) and (ii) and adding,


or

Apply law of conservation of energy,
or