Home
Class 11
PHYSICS
Find the average frictional force needed...

Find the average frictional force needed to stop a acar wieghing 500 kg in a distance of 25 m i the initial speed is 72 km/h.

Text Solution

Verified by Experts

The correct Answer is:
D
`,m=500g,S=25m,u=72km/h=20m/sec,v=0`

`rarr a=((v^2-u^2))/(2S)`
`(-a)=400/50=8m/sec^2`
FrictioN/Al Force `f=ma=500xx8=4000N`
Promotional Banner

Topper's Solved these Questions

  • WORK AND ENERGY

    HC VERMA|Exercise Objective -2|2 Videos

  • WAVE MOTION AND WAVES ON A STRING

    HC VERMA|Exercise Exercises|57 Videos

Similar Questions

Explore conceptually related problems

Find the averasge force needed to accelerate a car weighing 500 kg form rest to 72 km/h in a distance of 25 m.

In the arrangement show in figure, the track is frictionless until the body reaches the higher level. A frictional force stops the body in a distance d from A. The initial speed of the body v_(0) is 6 m/s the height h is 1 m and the coefficient of kinetic friction is 0.2. The speed of body at the higher level A is

How much force is required to stop a bus (in 10 seconds) of mass 5000 kg moving with a speed of 72 km/h?

How much force is required to stop a bus ( in 10 seconds) of mass 5000 kg moving with a speed of 72 km/h?

An automobile travelling with a speed 60 km//h , can brake to stop within a distance of 20 m . If the car is going twice as fast i. e. , 120 km//h , the stopping distance will be

Two carts of masses 200 kg and 300 kg on horizontal rails are pushed apart. Suppose the coefficient of friction between the carts and the rails are same. If the 200 kg cart travels a distance of 36 m and stops. Then the distance travelled by the cart weighing 300 kg is : (if both have same initial speed) .

A train travels at a certain average speed for a distance of 63km and then travels a distance of 72km at an average speed of 6km/hr more than its original speed.If it takes 3 hours to complete the total journey,what is its original average speed?

An aeroplane is stopped for half an hour and now it has to cover a distance of 1500 km in given time so its speed is increased by 250 km/h find its initial speed.

HC VERMA-WORK AND ENERGY-Exercises
  1. A box weighing 2000 N is to be slowly slid through 20 m on a straigh t...

    Text Solution

    |

  2. a block of weight 100 N is slowly slid up on a smooth incline of incli...

    Text Solution

    |

  3. Find the average frictional force needed to stop a acar wieghing 500 k...

    Text Solution

    |

  4. Find the averasge force needed to accelerate a car weighing 500 kg for...

    Text Solution

    |

  5. A particle of mass m moves on a straight line with its velocity varyin...

    Text Solution

    |

  6. A block of mass 2.0 kg kept at rest on an inclined plane of inclinatio...

    Text Solution

    |

  7. A block of mass 2.0 kg is pushed down an inclined plane of inclination...

    Text Solution

    |

  8. A 250 g block slides on aeroug horizontal table. Find the work donen b...

    Text Solution

    |

  9. Water falling from a 50 m high fall is to be used for generating elect...

    Text Solution

    |

  10. A person is painting his house walls. He stands on a ladder with a buc...

    Text Solution

    |

  11. A projectivle is fired form the top of a 40 m hnigh cliff with an init...

    Text Solution

    |

  12. The 200 m free style women's swimming gold medal at Seol Olympic 1988 ...

    Text Solution

    |

  13. The US athlete Florence Griffith oyner won the 100 m spring gold medal...

    Text Solution

    |

  14. A water pump lifts water from a level 10 m below the ground. Water is ...

    Text Solution

    |

  15. An unruly demonstrator lifts a stone of mass 200 g from the ground and...

    Text Solution

    |

  16. In a factor it is desired to lift 2000 kg of metal through a distance ...

    Text Solution

    |

  17. A scooter company gives the following specifications about its product...

    Text Solution

    |

  18. A block of mass 30.0 kg is being brought down by a chain. If the block...

    Text Solution

    |

  19. The heavier bock in an atwood machine has a mass twice that of the lig...

    Text Solution

    |

  20. The two blocks in an Atwood machine have masses 2.0 kg and 3.0 kg. Fin...

    Text Solution

    |