Home
Class 11
PHYSICS
Two particle which are initially at rest...

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

A

`2v`

B

zero

C

`1.5v`

D

`v`

Text Solution

Verified by Experts

The correct Answer is:
B
Hence no external force acting on a system of particle and initially its centre of mass is at rest will be remain at rest in final position and the speed of centre of mass is zero.
Promotional Banner

Topper's Solved these Questions

  • SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

    KUMAR PRAKASHAN|Exercise SECTION-F QUESTIONS FROM MODULE|22 Videos

  • SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

    KUMAR PRAKASHAN|Exercise SECTION-F (SECTION-A) QUESTIONS PAPER|6 Videos

  • SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

    KUMAR PRAKASHAN|Exercise SECTION-D NCERT EXEMPLAR SOLUTIONS (LONG ANSWER TYPE QUESTIONS)|6 Videos

  • QUESTIONS ASKED IN JEE - 2020

    KUMAR PRAKASHAN|Exercise Question|16 Videos

  • THERMAL PROPERTIES OF MATTER

    KUMAR PRAKASHAN|Exercise Question Paper (Section - D) (Answer following in brief :) Each carry 4 marks|1 Videos

Similar Questions

Explore conceptually related problems

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

Two particles of equal mass 'm' go around a circle of radius R under the action of their mutual gravitaitonal attraction. The speed of each particle with respect to their centre of a mass is -

Two particles of equal mass (m) each move in a circle of radius (r) under the action of their mutual gravitational attraction find the speed of each particle.

Two pulse in a stretched string whose centers are initially 8cm apart are moving towards each other as shown in the figure. The speed of each pulse is 2cm//s . After 2seconds , the total energy of the pulse will be

Two particles of equal mass m move around a circle of radius R under the influence of their mutual gravitational attraction, the speed of each particle with respect to their center of mass will be ..........

Four particles, each of mass M and equidistant from each other, move along a circle of radius R under the action of their mutual gravitational attraction. The speed of each particle is:

Two objects of masses m and 4m are at rest at an infinite separation. They move towards each other under mutual gravitational attraction. If G is the universal gravitaitonal constant, then at separation r

Two identical particles move towards each other with velocity 2v and v respectively. The velocity of centre of mass is

The figure shows the positions and velocity of two particle. If the paritcle move under the mutual attraction of each other, then the position of centre of mass at t = 1 s is :-

A particle moves with deceleration along the circle of radius R so that at any moment of time its tangential and normal acceleration are equal in moduli. At the initial moment t=0 the speed of the particle equals v_(0) , then th speed of the particle as a function of the distance covered S will be

KUMAR PRAKASHAN-SYSTEMS OF PARTICLES AND ROTATIONAL MOTION-SECTION-E MULTIPLE CHOICE QUESTIONS
  1. Two bodies of mass 1 kg and 3 kg have position vectors hati+2hatj+hatk...

    Text Solution

    |

  2. A circular disc of moment of inertia I(1) is rotating in a horizontal ...

    Text Solution

    |

  3. Two particle which are initially at rest, move towards each other unde...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  6. Kilowatt-hour(kWh) is a unit of

    Text Solution

    |

  7. Two spherical bodies of mass M and 5 M and radii R and 2R repectively ...

    Text Solution

    |

  8. A force vecF=alphahati+3hatj+6hatk is acting at a point vecr=2hati-6ha...

    Text Solution

    |

  9. From a disc of radius R and mass M, a circular hole of diameter R, who...

    Text Solution

    |

  10. A disc and a sphere of same radius but different masses roll off on tw...

    Text Solution

    |

  11. A uniform circular disc of radius 50 cm at rest is free to turn about ...

    Text Solution

    |

  12. A particle of mass 10 g moves along a circle of radius 6.4 cm with con...

    Text Solution

    |

  13. Two rotating bodies A and B masses m and 2m with moment of inertia I(A...

    Text Solution

    |

  14. A solid sphere of mass m and radius R rotating about its diameter. A s...

    Text Solution

    |

  15. A light rod of length l has two masses m(1)andm(2) attached to its two...

    Text Solution

    |

  16. A thin uniform rod of mass .M. and length .L. rotates with constant an...

    Text Solution

    |

  17. A sphere of mass 3 kg and radius 0.2 m rolls down from the slope of he...

    Text Solution

    |

  18. In an orbital motion, the angular momentum vector is ………….

    Text Solution

    |

  19. A current of 5A flows in a resistor of 2 ohms. Calculate the energy di...

    Text Solution

    |

  20. Calculate the work done in a resistor of 20 ohm carrying 5A of current...

    Text Solution

    |