Home
Class 11
PHYSICS
A body of mass 3 kg fall freely from th...

A body of mass 3 kg fall freely from the building of height 60 m . Its kinetic energy after 3s will be `………`

A

557 J

B

246 J

C

1048 J

D

1297 J

Text Solution

Verified by Experts

The correct Answer is:
D
According to equation of accelerated motion ,
` :. V = v_(o) +"gt"= 0 +9.8 xx3`
` :. V = 29.4` m/s
` :. ` Kinetic energy after 3s
` K = 1/2 mv^(2)`
` = 1/2 xx 3xx (29.4)^(2)`
` K = 1297 J `
Promotional Banner

Topper's Solved these Questions

  • WORK, ENERGY AND POWER

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

  • WORK, ENERGY AND POWER

    KUMAR PRAKASHAN|Exercise QUESTION PAPER (SECTION - B)|2 Videos

  • WORK, ENERGY AND POWER

    KUMAR PRAKASHAN|Exercise SECTION - E Multiple Choice Questions (MCQs)|64 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

A sphere of mass 3 kg and radius 0.2 m rolls down from the slope of height 7 m, its rotational kinetic energy will be ………….

A object of weight 40 N is made to fall freely towards the ground from height 10 m. When it reaches the ground its kinetic energy would be ………….. J.

A block of mass 1 kg falls freely on a spring form a height of 20 cm as shown in figure . Find the compression in the spring if its force constant is 10^(3) N/m . ( Take g = 10.0 m//s^(2) )

A body of mass m kg starts falling from a distance 2R above the earth's surface. What is its kinetic energy when it has fallen to a distance 'R' above the earth's surface ? (where R is the radius of Earth)

A body of mass 5 kg climb a height of 10 m by the force of 170 N . Its velocity at this height wil be ……….

A particle fall freely from height s . At certain height its kinetic energy is three time to its potential energy ,them at any one instant its height and speed respectively …………..

A ball is falling freely from the height 10 m. On striking the ground its energy decreases 40 %, then how high can it jump?

A sphere of mass 2 kg moving at 36 km/hr collides head on with another sphere of mass 3 kg kept at rest . If after collision both spheres moves together then kinetic energy decreases by collision will be ……….

KUMAR PRAKASHAN-WORK, ENERGY AND POWER -SECTION - F Questions From Module (Sample questions for preparation of competitive exams)
  1. A sphere of mass 50 g moving with velocity of 10m/s collide with the r...

    Text Solution

    |

  2. A particle fall freely from height s . At certain height its kinetic ...

    Text Solution

    |

  3. A body of mass 3 kg fall freely from the building of height 60 m . ...

    Text Solution

    |

  4. A mass of 0.5 kg moving with a speed of 1.5 m/s on a horizontal smooth...

    Text Solution

    |

  5. inelastic collision of two sphere of right body ………

    Text Solution

    |

  6. Two bodies of mass 1 g and 4 g moving with equal kinetic energy then ...

    Text Solution

    |

  7. How much work done in pulling up a block of wood weighing 2kN for leng...

    Text Solution

    |

  8. The kinetic energy of a body becomes four times its intial value , the...

    Text Solution

    |

  9. An electron , a proton a deutron and alpha - particle have the same k...

    Text Solution

    |

  10. If a body of mass 100 kg takes hight 60 m in 1 minute how much power i...

    Text Solution

    |

  11. An engine delivered power of 30 kW to a car of mass 1250 kg and veloci...

    Text Solution

    |

  12. Which one of the following force is non- conservative ?

    Text Solution

    |

  13. A body of mass 1 kg is thrown upwards with a velocity 20 ms^(-1) .It m...

    Text Solution

    |

  14. If the kinetic energy of the body is increased by 300 % then , the in...

    Text Solution

    |

  15. A car of mass m is driven with acceleration 'a' along a staright leve...

    Text Solution

    |

  16. A man whose mass is 50 kg climbs up 20 steps of the stairs with mass o...

    Text Solution

    |

  17. A sphere of mass 2 kg moving at 36 km/hr collides head on with anothe...

    Text Solution

    |

  18. Two bodies of masses m(1) and m(2) have same linear momentum . The rat...

    Text Solution

    |

  19. An elastic balls falls from a height of 10 m . If lose 80 % of its to...

    Text Solution

    |

  20. A ball moving with velocity 2m/s collides head on with another station...

    Text Solution

    |