First slide
Collisions
Question

A body of mass 2kg is moving with velocity 10 m/s towards east. Another body of same mass and same velocity moving towards north collides with former and coalesces and moves towards north-east. Its velocity is

Moderate
Solution

Initial momentum = P=mvi^+mvj^
 |P|=2mv
Final momentum = 2m×V
By the law of conservation of momentum 
2m×V=2mvV=v2
In the problem v=10m/s  (given) 

 V=102=52m/s

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