Home
Class 11
PHYSICS
With which velocity should a student of...

With which velocity should a student of mass 80 kg run , so that his kinetic energy becomes 320 ?

A

2

B

`sqrt(2)`

C

3

D

`2sqrt(2)`

Text Solution

Verified by Experts

The correct Answer is:
D
`K = 1/2 mv^(2)`
` :. 320 = 1/2 xx 80 xx v^(2)`
` :. V^(2) = (320xx2)/80`
= 8
` :. V = 2sqrt(2) `m/s
Promotional Banner

Topper's Solved these Questions

  • WORK, ENERGY AND POWER

    KUMAR PRAKASHAN|Exercise SECTION - F Questions From Module (Sample questions for preparation of competitive exams)|23 Videos

  • WORK, ENERGY AND POWER

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

  • WORK, ENERGY AND POWER

    KUMAR PRAKASHAN|Exercise SECTION - D NCERT Exemplar Solutions (Long Answer Type Questions)|5 Videos

  • WAVES

    KUMAR PRAKASHAN|Exercise SECTION-F (Questions From Module) (Sample questions for preparation of competitive exams)|23 Videos

Similar Questions

Explore conceptually related problems

How fast should a student of mass 50 kg run , so that his kinetic energy becomes 625 J ?

Find the velocity of a body of mass 100 g having kinetic energy 20 J.

A body is thrown upward at intial velocity of 7 ms^(-1) , then at which height it's kinetic energy becomes half ?

A sphere of mass 50 g moving with velocity of 10m/s collide with the rest block at mass 950 g and embeded . The kinetic energy lost by sphere will be …….

An object of mass 16 kg has 3200 J of kinetic energy. What will be its velocity?

At what speed a person having 60 kg mass should run to acquire 750 J kinetic energy?

The oxygen molecule has a mass of 5.30 × 10^(-26) kg and a moment of inertia of 1.94×10^(-46) kg m^(2) about an axis through its centre perpendicular to the lines joining the two atoms. Suppose the mean speed of such a molecule in a gas is 500 m/s and that its kinetic energy of rotation is two thirds of its kinetic energy of translation. Find the average angular velocity of the molecule.

KUMAR PRAKASHAN-WORK, ENERGY AND POWER -SECTION - E Multiple Choice Questions (MCQs)
  1. Force vec(F ) = (60 hat(i) +50 hat(j)-3hat(k))N is applied on a parti...

    Text Solution

    |

  2. A body is displaced by 6 m in Y - direction by a force (5,2,3) N , so ...

    Text Solution

    |

  3. With which velocity should a student of mass 80 kg run , so that his...

    Text Solution

    |

  4. If an electron and a proton have equal kinetic energy , then the speed...

    Text Solution

    |

  5. A bullet is fired into a huge wooden block . The bullet while moving ...

    Text Solution

    |

  6. The electric energy consumed by a 500 W bulb in 2 hours is …….. unit .

    Text Solution

    |

  7. If linear momentum of a body is increases by 2 % its kinetic energy i...

    Text Solution

    |

  8. How fast should a student of mass 50 kg run , so that his kinetic ene...

    Text Solution

    |

  9. When force (3,2,1) Newton acts on a body , dispalcement of the body ...

    Text Solution

    |

  10. An engine pumps water through a hose pipe water passes through the pip...

    Text Solution

    |

  11. The potential energy of a system increase if work is done ……….

    Text Solution

    |

  12. A body projected vertically from the earth reaches a height to earth's...

    Text Solution

    |

  13. A particle is subjected to a force which varies with distance as shown...

    Text Solution

    |

  14. A mass m moving horizontally (along the X-axis) with velocity v collid...

    Text Solution

    |

  15. A uniform force of ( 3hat(i)+hat(j)) N acts on an particle of mass 2 k...

    Text Solution

    |

  16. Two similar springs P and Q have spring constant k(p) and k(Q) such...

    Text Solution

    |

  17. A particle of mass m id driven by a machine that delivers a constant p...

    Text Solution

    |

  18. Two particle of masses m(1).m(2) moves with initial velocities u(1) an...

    Text Solution

    |

  19. A ball is thrown vertically downwards from a height of 20 m with an in...

    Text Solution

    |

  20. On a frictionless surface , a block of mass . M moving at speed v c...

    Text Solution

    |