#### A particle of mass 'm' moving with velocity 'v' collides with stationary particle of mass 2m. Then the speed of the system after collision is ?   Option 1) 2v Option 2) v/2  Option 3) 3v  Option 4) v/3

As we learnt in

Kinetic energy -

- wherein

kinetic Energy is frame dependent

Option 1)

2v

Option is incorrect

Option 2)

v/2

Option is incorrect

Option 3)

3v

Option is incorrect

Option 4)

v/3

Option is correct