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NEET 2023

Exam: NEET
Year: 2023
Subject: Physics
Chapter: Center of Mass, Momentum and Collision

NEET 2023 · Physics · Center of Mass, Momentum and Collision

Two particles A and B initially at rest, move towards each other...

Two particles

A

and

B

initially at rest, move towards each other under mutual force of attraction. At an instance when the speed of

A

is

v

and speed of

B

is

3 v

, the speed of centre of mass is

Options

A $v$
B $4 v$
C $2 v$
DZero

Correct answer

D. Zero

Step-by-step solution

Only internal force is acting on the system. Therefore

\vec{F}_{\text{ext }}=0

. It is also given that the initial velocity of COM is zero, therefore it will remain at rest.

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