First slide

The steps in collision

Question

I. Linear momentum of the system remains constant.
II. Centre of mass of the system remains at rest.
Which of the following statement(s) is/are correct?

Moderate

A

I implies II and II implies I
B

I does not imply II and II does not imply I
C

I implies II but II does not imply I
D

II implies I but I does not imply II

Solution

If centre of mass is at rest, it definitely means momentum of the system is constant. But if momentum of the system is constant, it does not mean centre of mass is at rest.

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