Question

write law of conservation of momentum two object of the same mass are moving with the same velocity in opposite direction they collide together what will be the final velocity

Answer 1

the final velocity of the object becomes zero. It means object comes at rest.

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Answer 2

law of conservation of momentum state that if the total external torque acting on a system is 0 then it's angular momentum remain conserved I.e when torqueext=0
thenL=constant