Statement I: In a two-body collision, the momenta of the particles are equal and opposite to one another, before as well as after the collision when measured in the centre of mass frame. Statement. II: The momentum of the system is zero from the centre of mass frame.A. Both assertion and reason are true and reason is the correct explanation of assertion.B. Both assertion and reason are true but reason is not the correct explanation of assertion.C. Assertion is true and reason is false.D. Assertion is false and reason is true.

Statement I: In a two-body collision, the momenta of the particles are

1.	Statement I: In a two-body collision, the momenta of the particles are equal and opposite to one another, before as well as after the collision when measured in the centre of mass frame. Statement. II: The momentum of the system is zero from the centre of mass frame.A. Both assertion and reason are true and reason is the correct explanation of assertion.B. Both assertion and reason are true but reason is not the correct explanation of assertion.C. Assertion is true and reason is false.D. Assertion is false and reason is true.
Answer» Correct Answer - A The momentum of a system of particles from any frame is given by `vecP=mvecv_(CM)` From the centre of mass frame, `vecv_(CM)=vecO` `implies vecP=0` So individual bodies should have momenta is opposite directions to make net momentum zero.

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