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

2 v

B

0

C

1.5 v

D

v

Text Solution

Verified by Experts

The correct Answer is:
B
(b) Initially both the particles were at rest therefore velocity of centre of mass was zero, also there is no external force on the system so speed of centre of mass remains constant, i.e., it should be equal to zero.
Promotional Banner

Topper's Solved these Questions

  • ROTATIONAL DYNAMICS

    A2Z|Exercise AIIMS Questions|40 Videos

  • ROTATIONAL DYNAMICS

    A2Z|Exercise Chapter Test|29 Videos

  • ROTATIONAL DYNAMICS

    A2Z|Exercise Assertion Reasoning|20 Videos

  • PROPERTIES OF MATTER

    A2Z|Exercise Chapter Test|29 Videos

  • THERMAL PROPERTIES OF MATTER

    A2Z|Exercise Chapter Test|30 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 :

A2Z-ROTATIONAL DYNAMICS-NEET Questions
  1. Two bodies of mass 1 kg and 3 kg have position vectors hat i+ 2 hat j ...

    Text Solution

    |

  2. A circular disc of moment of inertia I(t) is rotating in a horizontal...

    Text Solution

    |

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

    Text Solution

    |

  4. A man of 50 kg mass is standing in a gravity free space at a height of...

    Text Solution

    |

  5. The instantaneous angular position of a point on a rotating wheel is g...

    Text Solution

    |

  6. The moment of inertia of a thin uniform rod of mass M and length L abo...

    Text Solution

    |

  7. A small mass attached to a string rotates on a frictionless table top ...

    Text Solution

    |

  8. When a mass is rotating in a plane about a fixed point, its angular mo...

    Text Solution

    |

  9. Two persons of masses 55 kg and 65 kg respectively are at the opposite...

    Text Solution

    |

  10. O is the centre of an equilateral triangle ABC. F(1), F(2) and F(3) ar...

    Text Solution

    |

  11. A circular platform is mounted on a frictionless vertical axle. Its ra...

    Text Solution

    |

  12. The moment of inertia of a uniform circular disc is maximum about an a...

    Text Solution

    |

  13. Three masses are placed on the x-axis : 300 g at origin. 500 g at x = ...

    Text Solution

    |

  14. A solid cylinder of mass 3 kg is rolling on a horizontal surface with ...

    Text Solution

    |

  15. A small object of uniform density rolls up a curved surface with an in...

    Text Solution

    |

  16. A rod PQ of mass M and length L is hinged at end P. The rod is kept ho...

    Text Solution

    |

  17. A cylinder of mass 50 mg and radius 0.5 m is free to rotate about the ...

    Text Solution

    |

  18. The ratio of the accelerations for a solid sphere (mass m, and radius ...

    Text Solution

    |

  19. A mass m moves in a circles on a smooth horizontal plane with velocity...

    Text Solution

    |

  20. A rod of weight w is supported by two parallel knife edges A and B and...

    Text Solution

    |