Home
Class 12
PHYSICS
Two particles A and B initially at rest,...

 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

A

Zero

B

v

C

2.5

D

4v

Text Solution

Verified by Experts

The correct Answer is:
(a)
Initially, two particles were at rest, velocity of centre of mass is zero and there is no external force on the system. Therefore speed of centre of mass remains constants.i.e., zero.
Promotional Banner

Topper's Solved these Questions

  • SEMICONDUCTOR ELECTRONICS

    SIA PUBLICATION|Exercise MCQ|90 Videos

  • THERMAL CONDUCTIVITY

    SIA PUBLICATION|Exercise Problems|96 Videos

Similar Questions

Explore conceptually related problems

Two particles of masses 4 kg and 6 kg are at rest separated by 20 m. If they move towards each other under mutual force of attraction, the position of the point where they meet is

(A) : Two particles (starting from rest) move towards each other under a mutual force of attraction. The velocity of their c.m is zero. (R ) : Internal forces do not alter the state of motion of c.m.

Two spheres of masses 2M and M are initially at rest at a distance R apart. Due to mutual force of attraction, they approach each other. When they are at separation R/2, the acceleration of the centre of mass of spheres would be

SIA PUBLICATION-SYSTEM OF PARTICLES AND ROTATIONAL MOTION-MCQ
  1. A rod of length / is held vertically stationary with its lower end loc...

    Text Solution

    |

  2. A wheel of radius 0.4 m can rotate freely about its axis as shown in t...

    Text Solution

    |

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

    Text Solution

    |

  4. Starting from rest, the time taken by a body sliding down on a rough i...

    Text Solution

    |

  5. The moment of inertial of a thin circular disc about an axis passing t...

    Text Solution

    |

  6. Two bodies of 6 kg and 4 kg masses have their velocity  5hati-2hatj+10...

    Text Solution

    |

  7. Two solid spheres (A and B) are made of metals of different densities ...

    Text Solution

    |

  8. When the angle of inclination of an inclined plane is an object slides...

    Text Solution

    |

  9. A uniform rod of length 8 a and mass 6 m lies on a smooth horizontal s...

    Text Solution

    |

  10. Assume the earth's orbit around the sun as circular and the distance b...

    Text Solution

    |

  11. The centre of mass of three particles of masses 1 kg, 2 kg and 3 kg is...

    Text Solution

    |

  12. The minimum force required to move a body up an inclined plane is thre...

    Text Solution

    |

  13. The instantaneous velocity of a point B of the given rod of length 0.5...

    Text Solution

    |

  14. Identify the increasing order of the angular velocities of the followi...

    Text Solution

    |

  15. Two particles of equal mass have velocitiesvecV (1)= 4hati ms^(-1) and...

    Text Solution

    |

  16. A thin uniform square lamina of side a is placed in the xy plane with ...

    Text Solution

    |

  17. A particle of mass 1 kg is projected with all initial velocity10 ms^(-...

    Text Solution

    |

  18. Two objects of masses 200 g and 500 g possess velocities 10hati ms^(-1...

    Text Solution

    |

  19. The moment of inertia of meter scale of mass 0.6 kg about an axis perp...

    Text Solution

    |

  20. A circular disc of radius R and thickness (R)/(6) has moment of inerti...

    Text Solution

    |