Home
Class 11
PHYSICS
A running man has half the KE that a bod...

A running man has half the KE that a body of half his mass has. The man speeds up by `1.0ms^(-1)` and then has the same energy as the boy. What were the original speeds of the man and the boy?

A

`sqrt(2)m//s`

B

`(sqrt(2)-1)m//s`

C

`(1)/((sqrt(2)-1))m//s`

D

`(1)/(sqrt(2))m//s`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • WORK, ENERGY, POWER & COLLISION

    ERRORLESS |Exercise Assertion|30 Videos

  • WORK , ENERGY , POWER AND COLLISION

    ERRORLESS |Exercise Self Evaluation Test|19 Videos

Similar Questions

Explore conceptually related problems

A man who is running has half the kinetic energy of a boy of half his mass. The man speeds up by 1 ms^(-1) and then has the same kinetic energy as the boy. The original speed of the boy was:

A running man has the same kinetic energy as that of a boy of half his mass. The man speed up by 2 ms^(-1) and the body changes his speed by x ms^(-1) so that the kinetic energies of the boy and the man are again equal. Then x in ms^(-1) is

A man has twice the mass of a boy and has half the kinetic energy of the boy. The ratio of the speeds of the man and the boy must be

A lady running on the road has kinetic energy that is half of that of girl . The girl's mass is half of the lady's mass. The lady increases her speed y m/s and then has the same energy as of girl . Calculate the original speeds of the lady and the girl .

ERRORLESS -WORK, ENERGY, POWER & COLLISION-Assertion
  1. A running man has half the KE that a body of half his mass has. The ma...

    Text Solution

    |

  2. Statement-1: A person walking on a horizontal road with a load on his ...

    Text Solution

    |

  3. Assertion : The work done during a round trip is always zero. Reaso...

    Text Solution

    |

  4. Assertion : Work done by friction on a body sliding down an inclined...

    Text Solution

    |

  5. Assertion : When a gas is allowed to expand, work done by gas is pos...

    Text Solution

    |

  6. Assertion: A light body and a heavy body have same momentum. Then they...

    Text Solution

    |

  7. Assertion: The instantaneous power of an agent is measured as the dot...

    Text Solution

    |

  8. Assertion: The change in kinetic energy of a particle is equal to the ...

    Text Solution

    |

  9. Assertion: A spring has potential energy , both when it is compressed ...

    Text Solution

    |

  10. Statement-1:Comets move around the sun in elliptical orbits, the gravi...

    Text Solution

    |

  11. Assertion: Internal forces cannot change linear momentum. Reason: In...

    Text Solution

    |

  12. Assertion : Water at the foot of the water fall is always at differe...

    Text Solution

    |

  13. Assertion : The power of a pump which raises 100 kg of water in 10...

    Text Solution

    |

  14. Assertion: According to law of conservation of mechanical energy chang...

    Text Solution

    |

  15. Assertion : When the force retards the motion of a body, the work do...

    Text Solution

    |

  16. Assertion: In an elastic collision of two bodies , the momentum and en...

    Text Solution

    |

  17. Assertion : A body cannot have energy without possessing momentum but...

    Text Solution

    |

  18. Assertion : Power developed in circular motion is always zero. Reas...

    Text Solution

    |

  19. Assertion : A kinetic energy of a body is quadrupled, when its veloc...

    Text Solution

    |

  20. Assertion: A quick collision between two bodies is more violent that s...

    Text Solution

    |

  21. Assertion : Work done by or against gravitational force in moving a b...

    Text Solution

    |