Home
Class 12
PHYSICS
A body is dropped from a certain height....

A body is dropped from a certain height. At the instant it loses P.E.U. It acquires a velocity 'v' the mass of the body is :

A

`U^(2)//2V`

B

`2V//U`

C

`2V//U^(2)`

D

`2U//V^(2)`

Text Solution

Verified by Experts

The correct Answer is:
d
Gain in K.E. = loss in p.E.
`:. 1/2mv^(2)=U`
`:. M=(2U)/(V^(2))`
Promotional Banner

Topper's Solved these Questions

  • WORK , POWER , ENERGY AND COLLISIONS

    MODERN PUBLICATION|Exercise Multiple Choice Questions (LEVEL-II)|67 Videos

  • WORK , POWER , ENERGY AND COLLISIONS

    MODERN PUBLICATION|Exercise Multiple Choice Questions (LEVEL-III)|5 Videos

  • WAVE OPTICS

    MODERN PUBLICATION|Exercise Recent Competitive Questions|18 Videos

Similar Questions

Explore conceptually related problems

A body of mass 1 kg strikes elastically with another body at rest and continues to move in the same direction with one fourth of its initial velocity. The mass of other body is :

A body is dropped from certain height above the ground and covers ((5)/(36))^("th") of the total height during the last second of the fall. Calculate height from which the body was dropped. (g=10ms^(-2))

A body falls on the ground from a height of 10 metre and rebounds to a height of 2.5 m. The ratio of the velocity of the body before collision to the velocity of the body after collision is:

Say whether the escape speed and orbital velocity of a body depend on the mass of the body ?

A body moving with the constant retardation d loses 2/3 of its initial velocity w What is the distance covered by the body in the time during which it occurs ?

A body is dropped from a height of 125 m. If = 10 ms^(-2) what is the ratio of the distances travelled by it during the first and last second of its motion :

A body is released from the top of a tower of height metre. It takes time T seconds to reach the ground. Where is the body at time T/2 seconds?

A body is released from a great height and falls freely under gravity vertically towards eurth. Another body is released from the same height exactly one second later from the same point. Separation between the two after 2 second of release of the second body is :

MODERN PUBLICATION-WORK , POWER , ENERGY AND COLLISIONS-Revision Test
  1. A body is dropped from a certain height. At the instant it loses P.E.U...

    Text Solution

    |

  2. A ball is dropped from height of Im. If coefficient of restituion betw...

    Text Solution

    |

  3. A metal ball hits a wall and does not rebound, where as  b a rubber ba...

    Text Solution

    |

  4. The velocity of a body of mass 2.5 kg is changed from vecVi =(3hati-4h...

    Text Solution

    |

  5. The value of 1 Mev is equal to :

    Text Solution

    |

  6. A particle is projected vertically upwards with a velocity given by V=...

    Text Solution

    |

  7. A spring of constant 5xx10^(3) N/m is stretched initially by 5 cm from...

    Text Solution

    |

  8. Consider the following two statements. a. Linear momentum of a sys...

    Text Solution

    |

  9. A body of volume V and dinsity p is raised through height h in a liqiu...

    Text Solution

    |

  10. A child is swinging a swing. He is one metre above the ground at the l...

    Text Solution

    |

  11. A canon shell explodes in mid air, its total

    Text Solution

    |

  12. A body at rest may have :

    Text Solution

    |

  13. A car is moving along a straight horizontal road with a speed V. If th...

    Text Solution

    |

  14. If a body of mass m moving with velocity v collides with another body ...

    Text Solution

    |

  15. A ball is projected vertically upward with an initial velocity. Which ...

    Text Solution

    |

  16. A motor with an efficiency of 90% drives a pump, whose efficiency is 6...

    Text Solution

    |

  17. A lorry and a car moving with the same kinetic energy are bought to re...

    Text Solution

    |

  18. The power of motor pump is 2 KW. The water raised by the pump per minu...

    Text Solution

    |

  19. The energy required to accelerate a car from rest to 10 ms^(-1) is W. ...

    Text Solution

    |

  20. A man weighing 60 kg lifts a body of 15 kg to a top of building 10 m h...

    Text Solution

    |

  21. A sphere of mass M moving with velocity w collides elastically with an...

    Text Solution

    |