Home
Class 11
PHYSICS
A child weighing 25 kg slides down a rop...

A child weighing 25 kg slides down a rope hanging from the branch of a tall tree. If the force of friction acting against him is 2 N , what is the acceleration of the child

A

`22.5 m//s^(2)`

B

`8 m//s^(2)`

C

`5 m//s^(2)`

D

`9.72 m//s^(2)`

Text Solution

Verified by Experts

The correct Answer is:
D
Neto downward force = Weight - Friction
ma = `25 xx 9.8 -2`
`implies a = (25 xx 9.8 -2)/(25) = 9.72 m//s^(2)`
Promotional Banner

Topper's Solved these Questions

  • FRICTION

    ERRORLESS|Exercise NCERT BASED QUESTIONS (Motion on Inclined Surface )|11 Videos

  • FRICTION

    ERRORLESS|Exercise PAST YEARS QUESTIONS |11 Videos

  • FRICTION

    ERRORLESS|Exercise ASSERTION & REASON |8 Videos

  • FLUID MECHANICS

    ERRORLESS|Exercise ASSERTION AND REASON|23 Videos

  • GRAVITATION

    ERRORLESS|Exercise Assertion and Reason |25 Videos

Similar Questions

Explore conceptually related problems

A child weighing 25 kg slides down a rope hanging from a branch of a tall tree. If the force of friction acting against him is 200 N, the acceleration of child is (g=10 m//s^(2))

A body weighing 20 kg just slides down a rough inclined plane that rises 5 m in every 13 m. What is the coefficient of friction?

A fireman of mass 60 kg slides down a pole. He is pressing the pole with a force of 600N. The coefficient of friction between the hands and the pole is 0.5, with what acceleration will the fireman slide down (g=10(m)/(s^2) )

A monkey is decending from the branch of a tree with constant acceleration. If the breaking strength is 75% of the weight of the monkey, the minimum acceleration with which monkey can slide down without breaking the branch is

A wheel of radius R , mass m and moment of inertia I is pulled along a horizontal surface by application of force F to as rope unwinding from the axel of radius, r as shown in figure. Friction is sufficient for pure rolling of the wheel. a. What is the linear acceleration of the wheel? b. Calculate the frictional force that acts on the wheel.

A block of mass 5 kg is initially at rest on a rough horizontal surface. A force of 45 N acts over a distance of 2 m . The force of friction acting on the block is 25 N . The final kinetic energy of the block is

A rope is wound round a hollow cylinder of mass 3 kg and radius 40 cm . If the rope is pulled with a force of 30 N , what is the angualr acceleration of the cylinder ?

ERRORLESS-FRICTION -NCERT BASED QUESTIONS (Kinetic Friction )
  1. A car is moving along a straight horizontal road with a speed v(0) . I...

    Text Solution

    |

  2. A conveyor belt is moving at a constant speed of 2m//s . A box is gent...

    Text Solution

    |

  3. Direction of frictional force between wheel of the car and road is

    Text Solution

    |

  4. A force of 20N is applied on a body of mass 5 kg resting on a horizont...

    Text Solution

    |

  5. Consider a car moving along a straight horizontal road with a speed of...

    Text Solution

    |

  6. On the horizontal surface of a truck (mu=0.6) a block of mass 1 kg is...

    Text Solution

    |

  7. An iron block of mass 5 kg is kept on a trolley. If the trolley is bei...

    Text Solution

    |

  8. A gramphone record is revolving with an angular velocity omega. A coin...

    Text Solution

    |

  9. A body moves along a circular path of radius 10m and the coefficient ...

    Text Solution

    |

  10. A block B is pushed momentarily along a horizontal surface with an ini...

    Text Solution

    |

  11. A child weighing 25 kg slides down a rope hanging from the branch of a...

    Text Solution

    |

  12. A body of mass 2 kg is moving on the ground comes to rest after some t...

    Text Solution

    |

  13. A block of mass m is in contact with the cart C as shown in the figure...

    Text Solution

    |

  14. A boy presses a book against the front wall such that the book does no...

    Text Solution

    |

  15. In the figure given, the system is in equilibrium. What is the maximum...

    Text Solution

    |

  16. Two carts of masses 200 kg and 300 kg on horizontal rails are pushed a...

    Text Solution

    |

  17. A vehicle of mass m is moving on a rough horizontal road with momentum...

    Text Solution

    |

  18. The rear side of a truck is open and a box of 40 kg mass is placed 5 m...

    Text Solution

    |

  19. A small box resting on one edge of the table is struck in such a way t...

    Text Solution

    |

  20. A cylinder of 10 kg is sliding in a plane with an initial velocity of ...

    Text Solution

    |