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  • Try this! - Motion of System Of Particles and Rigid Body - NEET-3

Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are \nu and 2\nu at any instant, then the speed of centre of mass of the system will be

  • Option 1)

    2\nu

  • Option 2)

    Zero

  • Option 3)

    1.5

  • Option 4)

    \nu

 

Answers (1)

As learnt in

If External Force = 0 and Velocity of Centre of Mass = 0 -

Then centre of mass remains at rest. Individual components of a system may move and have non zero momentum due to  mutual forces but the net momentum of system remains zero. 

-

 

 F_{ext}=0

i.e., speed of centre of mass is zero.


Option 1)

2\nu

This option is incorrect.

Option 2)

Zero

This option is correct.

Option 3)

1.5

This option is incorrect.

Option 4)

\nu

This option is incorrect.

Posted by

subam

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