Home
Class 11
PHYSICS
A body of mass 1 kg falls to the ground ...

A body of mass 1 kg falls to the ground from the roof of a building 20 m high. Find its
(i) initial potential energy,

Text Solution

Verified by Experts

Initial potential energy of the body
`=mgh =1xx9.8xx20=196 J`.
Promotional Banner

Topper's Solved these Questions

  • WORK AND ENERGY

    CHHAYA PUBLICATION|Exercise SECTION RELATED QUESTIONS|24 Videos
  • WORK AND ENERGY

    CHHAYA PUBLICATION|Exercise HIGHER ORDER THINKING SKILL (HOTS) QUESTIONS|38 Videos
  • WBCHSE QUESTION PAPER -2019

    CHHAYA PUBLICATION|Exercise SECTION - II ( GROUP -D)|10 Videos

Similar Questions

Explore conceptually related problems

A body of mass 1 kg falls to the ground from the roof of a building 20 m high. Find its (iv) kinetic and potential energies at a position 2 m above the earth's surface.

A body of mass 1 kg falls to the ground from the roof of a building 20 m high. Find its (iii) Maximum kinetic energy and

A body of mass 1 kg falls to the ground from the roof of a building 20 m high. Find its (ii) velocity when it reaches the ground,

A body of mass 100g is dropped from the top of a tower 100m high. Find its kinetic energy (i) one second after the drop,

A body of mass 1 kg falls to the ground from a height of 1km. If the entire amount of energy is converted into heat , find out the amount of heat produced. (J = 4 cdot 1 xx 10^(7) erg cdot cal^(-1)) .

A body of mass 100g is dropped from the top of a tower 100m high. Find its kinetic energy (ii) just before it touches the ground.

A body is projected horizontally from the top of a building of height h. Velocity of projection is u. Find the time it will take to reach the ground ,

An object of mass 10 kg executes SHM. Its time period and amplitude are 2s and 10 m respectively. Find its kinetic energy when it is at a distance of (i) 2 m and (ii) 5 m respectively from its position of equilibrium. Justify the two different results for (i) and (ii).

A boy of mass 20 kg , moved up to the top of a building of height 18 m , carrying a box of mass 2.5 kg. if he did this in 1.5 min, what was his rate of doing work ?

CHHAYA PUBLICATION-WORK AND ENERGY-CBSE SCANNER
  1. A body of mass 1 kg falls to the ground from the roof of a building 20...

    Text Solution

    |

  2. Prove that the total mechanical energy remains constant for a ball mas...

    Text Solution

    |

  3. Answer with reason: In an elastic collision of two billiard balls, is ...

    Text Solution

    |

  4. The casting of a rocket in flight burns up due to friction. At whose e...

    Text Solution

    |

  5. What are conservative forces ? Give an example.

    Text Solution

    |

  6. Distinguish between elastic and inelastic collisions.

    Text Solution

    |

  7. if the force applied on an object is 5N and the power expended by it 2...

    Text Solution

    |

  8. From the graph shown Fig.1.73 calculate the work done by the applied ...

    Text Solution

    |

  9. State and prove law of conservation of mechanical energy in a free fal...

    Text Solution

    |

  10. Two objects of masses in the ratio 1:2 collide elastically with each ...

    Text Solution

    |

  11. State and prove work- energy theorem for a variable force.

    Text Solution

    |

  12. What will happen in an elastic collision in one dimension when a heav...

    Text Solution

    |

  13. Two bodies A and B weighing 5kg and 6kg respectively have equal momen...

    Text Solution

    |

  14. What is meant by elastic collision ? Show that when two bodies of equa...

    Text Solution

    |

  15. State work-energy theorem. Prove it for a constant force.

    Text Solution

    |

  16. Two bodies of different masses have equal kinetic energies . Which wi...

    Text Solution

    |

  17. Angad and Nalin were observing a building having two different stairca...

    Text Solution

    |

  18. Angad and Nalin were observing a building having two different stairca...

    Text Solution

    |

  19. Angad and Nalin were observing a building having two different stairca...

    Text Solution

    |

  20. Prove that the velocity get interchange in case of elastic collision o...

    Text Solution

    |

  21. State work-energy theorem. The momentum of a body of mass 5 kg is 500 ...

    Text Solution

    |