Home
Class 11
PHYSICS
Two identical 5 kg blocks are moving wi...

Two identical 5 kg blocks are moving with same speed of `2 m s^-1` towards each other along a frictionless horizontal surrface.the two blocks collide,stick together and come to rest.Consider the two blocks as a system.The work done by external and internal forces are respectively:

A

`0,0`

B

`0, 20 J`

C

`0,-20 J`

D

`20J,-20J`.

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • WORK,ENERGY AND POWER

    JBD PUBLICATION|Exercise EXAMPLE|109 Videos

  • Thermodynamics

    JBD PUBLICATION|Exercise EXAMPLE|69 Videos

Similar Questions

Explore conceptually related problems

Two bodies of different masses of 2 kg and 4 kg are moving with velocities 2 ms^-1 and 10 ms^-1 towards each other due to mutual gravitational attraction. What is velocity of their centre of mass?

A block of mass m moving at a speed v collides with another block of mass 2 m at rest.The lighter block comes to rest after the collision.Find the coefficient of restitution.

A ball of mass m, moving with a speed 2v_0 collides inelastically (e>0) with an identical ball at rest. Show that For a general collision, the angle between the two velocities of scattered balls is less than 90^@ .

A proton moves with speed of 7.45 xx10^5ms^-1 directly towards a free proton orginally at rest. Find the distance of the closet approach for the two protons (m_p=1.66 xx 10^-27kg) .

Two identical ball bearing in contact with each other and resting on a frictionless table are hit head on by another ball bearing of the same mass moving initially with a speed V shown in the figure. If the collision is elastic, which of the folloiwng shown in the figure is a possible result after collision ?

Two billiard balls each of mass 0.05 kg moving in opposite directions with speed 6 m s^-1 collide and rebound with the same speed. What is the impulse imparted to each ball due to the other ?

Two identical particles of mass m carry a charge Q, each. Initially one is at rest on a smooth horizontal plane and the other is projected along the plane directly towards first particle from a large distance with speed v. The closest distance of approach be .

JBD PUBLICATION-WORK,ENERGY AND POWER-EXAMPLE
  1. Two identical 5 kg blocks are moving with same speed of 2 m s^-1 towa...

    Text Solution

    |

  2. What is SI unit of work?

    Text Solution

    |

  3. What is the relation between watt and horse power?

    Text Solution

    |

  4. What is the S.I. unit of energy?

    Text Solution

    |

  5. What is the SI unit of power ?

    Text Solution

    |

  6. Can acceleration be produced without doing any work?

    Text Solution

    |

  7. What is the work done in holding a 15 kg suitcase whiel waiting for a...

    Text Solution

    |

  8. An arrow is shot from a bow, from where does it get kinetic energy?

    Text Solution

    |

  9. What kind of energy is stored in a dam?

    Text Solution

    |

  10. What kind of energy is stored in a spring?

    Text Solution

    |

  11. Is mass of a body conserved?

    Text Solution

    |

  12. What is the work done by centripetal force?/

    Text Solution

    |

  13. What it Einstein's mass energy relation?

    Text Solution

    |

  14. For a force to do maximum work, what should be the angle between force...

    Text Solution

    |

  15. Can potential nergy of an object be negative?

    Text Solution

    |

  16. Can KE of a system be increased or decreased without the application o...

    Text Solution

    |

  17. Is linear momentum of any system always conserved?

    Text Solution

    |

  18. Name motion in which momentum changes but K.E. remains constant.

    Text Solution

    |

  19. Out of joule ,calories ,kilowatt and million electron volt,which one i...

    Text Solution

    |

  20. Does the work done in raising a box on a platform depend upon how fast...

    Text Solution

    |

  21. How many ergs are there in one joule?

    Text Solution

    |