# Hey! Why did you collide when I was resting?

**Classical Mechanics**Level 3

*A* and *B* lie along same straight line. Mass of particle *A* is \(2.5\) *kg* and of *B* is \(22.5\) *kg*. Particle *A* is travelling with intial velocity **u** = \(375\) *m/s* while *B* is at rest. Then after sometime they both collide head on elastically. The total linear momentum of system is conserved. Then find the velocity of particle *B* after collision in *m/s* .

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