Grade 11Mechanics

Two particles A and B initially at rest move towards each other under a mutual force of attraction. At the instant when the speed of A is V and the speed of B is 2v the speed of the center of mass of system is

Roshini

8 Years agoGrade 11

5 Answers

Pooja

8 Years ago

At initial position both A and B are at rest, hence momentum is zero. It is given that no external force is acting on them .So, momentum remains zero. Since mass cannot be zero, therefore velocity is zero.

Shailendra Kumar Sharma

8 Years ago

From rest and there is no net force on Com Thus the CON will not move from its position. Due to lack of external force

Jj

7 Years ago

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Subham

7 Years ago

When A and B are at rest position initially then we can say momentum is zero and it is said in the question that no external force is acting on the body so momentum will be zero since mass has some quantity so it can't gain zero condition so velocity will be zero

Thanks a lot🤗🤗🤗

aatif ahmad

7 Years ago

As both bodies were initially at rest,so CONSERVATION OF LINEAR MOMENTUM states that initial momentum is equal to final momentum provided that no external force[f.ext] acts on the system.So initially v.com=0 and finally to keep momentum 0 i.e conserved we should keep v .com =0 because mass of body can never be zero......HOPE IT HELPS..