Home
Class 11
PHYSICS
Two paricle A and B initially at rest, m...

Two paricle A and B initially at rest, move towards each other under 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 centre of mass of the system is

A

zero

B

v

C

1.5v

D

3v

Text Solution

Verified by Experts

The correct Answer is:
A

`P_(i)=0`
`therefore` `P_(f) = 0` or center of mass should be at rest at all instants.
Promotional Banner

Topper's Solved these Questions

  • CENTRE OF MASS

    DC PANDEY|Exercise Taking it together|73 Videos
  • CENTRE OF MASS

    DC PANDEY|Exercise Assertion and reason|21 Videos
  • CENTRE OF MASS

    DC PANDEY|Exercise Medical entrances gallery|27 Videos
  • CALORIMETRY AND HEAT TRANSFER

    DC PANDEY|Exercise Medical entrance s gallery|38 Videos
  • CENTRE OF MASS, IMPULSE AND MOMENTUM

    DC PANDEY|Exercise Comprehension type questions|15 Videos

Similar Questions

Explore conceptually related problems

Two particles A and B initially at rest, move towards each other by mutual force of attraction. At the instant when the speed of A is n and the speed of B is 3n , the speed of the centre of mass of the system is

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 2v , the speed of centre of mass ( CM ) is

Two partticles A and B intially at rest move towards each other under a mutual force of attraction. The instant at which velocity of A is 4v and velocity of B is 2v , the velocity of centre of mass of the system at that instant will be

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

Two particles A and B with particle A having mass m, are moving towards each other under their mutual force of attraction. If their speeds at certain instant are v and 2v respectively, then find the K.E. of the system.

10 Two particles of masses m_(1) and m_(2) initially at rest start moving towards each other under their mutual force of attraction. The speed of the centre of mass at any time t, when they are at a distance r apart, is

Two particles of mass m_(1) and m_(2) are approaching towards each other under their mutual gravitational field. If the speed of the particle is v, the speed of the center of mass of the system is equal to :

DC PANDEY-CENTRE OF MASS-Check points
  1. Two balls are thrown simultaneously in air. The acceleration of the ce...

    Text Solution

    |

  2. Consider a system of two identical particles. One of the particls is a...

    Text Solution

    |

  3. Two paricle A and B initially at rest, move towards each other under m...

    Text Solution

    |

  4. Two balls of equal mass are projected from a tower simultaneously with...

    Text Solution

    |

  5. One projectile moving with velocity v in space, gets burst into 2 part...

    Text Solution

    |

  6. A bomb of mass 9kg explodes into two pieces of masses 3 kg and 6kg. Th...

    Text Solution

    |

  7. Two blocks of masses 10 kg and 4 kg are connected by a spring of negli...

    Text Solution

    |

  8. A ball kept in a closed box moves in the box making collisions with th...

    Text Solution

    |

  9. A meter stick is placed vertically at the origin on a frictionles surf...

    Text Solution

    |

  10. Two bodies having masses m(1) and m(2) and velocities v(1) and v(2) co...

    Text Solution

    |

  11. Two particles of equal mass have coordinates (2m,4m,6m) and (6m,2m,8m)...

    Text Solution

    |

  12. An isolated particle of mass m is moving in horizontal plane xy along ...

    Text Solution

    |

  13. Blocks A and B are resting on a smooth horizontal surface given equal ...

    Text Solution

    |

  14. A man of mass m is standing on a plank of equal mass m resting on a sm...

    Text Solution

    |

  15. An object of mass 3m splits into three equal fragments. Two fragments ...

    Text Solution

    |

  16. A stationary bomb explode into two parts of masses 3kg and 1kg. The to...

    Text Solution

    |

  17. A shell of mass m is moving horizontally with velocity v(0) and collid...

    Text Solution

    |

  18. A shell is fired from a cannon with a velocity v (m//sec.) at an angle...

    Text Solution

    |

  19. In an eleastic collision

    Text Solution

    |

  20. If a body of mass m collides head on, elastically with velocity u with...

    Text Solution

    |