Home
Class 11
PHYSICS
By applying the brakes without causing s...

By applying the brakes without causing skid, the driver of a car is able to stop his car with in a distance of `5 m`, if it is going at `36 kmph`. If the car were going at `72 kmph`. Using the same brakes, he can stop the car over a distance of

A

10 m

B

`2.5 m`

C

20 m

D

40 m

Text Solution

Verified by Experts

The correct Answer is:
`(3)`
`W = Delta KE, Delta KE_(1)/Delta KE_(2) = W_(1)/W_(2) = FS_(1)/FS_(2)`
Promotional Banner

Topper's Solved these Questions

  • WORK , ENERGY & POWER

    NARAYNA|Exercise EXERCISE -II (C.W)|75 Videos

  • WORK , ENERGY & POWER

    NARAYNA|Exercise EXERCISE -II (H.W)|75 Videos

  • WORK , ENERGY & POWER

    NARAYNA|Exercise EXERCISE - 1 (C.W)|70 Videos

  • WAVES

    NARAYNA|Exercise Exercise-IV|56 Videos

  • WORK POWER AND ENERGY

    NARAYNA|Exercise Level-VI (Integer)|12 Videos

Similar Questions

Explore conceptually related problems

A truck and a car are moving with equal velocity. On applying the brakes both will stop after certain distance, then

A car moving with speed v on a straight road can be stopped with in distance d on applying brakes. If same car is moving with speed 3v and brakes provide half retardation, then car will stop after travelling distance

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

A man with a constant time of reaction can stop his car within 30 m when its speed is 72 kmph and within 10 m when its speed is 36 kmph.What is the distance within which he can stop his car when speeding at 54 kmph ?

The driver of a car moving with a speed of 10 ms^(-1) sees a red light ahead, applies brakes and stops after covering 10 m distance. If the same car were moving with a speed of 20 ms^(-1) the same driver would have stopped the car after covering 30 m distance. Within what distance the car can be stopped if traveling with a velocity of 15 ms^(-1) Assume the same reaction time and the same deceleration in each case

Which of the following is true when we apply brake to stop a car?

A car moving with a speed v is stopped by applying brakes with in a distance s and time t. If it would have been travelling with Kv then by applying same breaking force it can be stopped with in

A car moving with a velocity v is stopped within a distance x by applying a retarding force F. If the speed of the car is doubled, then the force required to stop the car with the same distance is

A driver of a car A travelling at 54 km//h applies the brakes and stops the car in 4 seconds. Another driver of car B travelling at 36 km//h applies the brakes and stops the car in 6 seconds. Plot speed versus time graphs for the two car. which of the cars travelled farther before stopping ?

NARAYNA-WORK , ENERGY & POWER -EXERCISE -1 (H.W)
  1. A body of mass 2 kg is projected with an initial velocity of 5 ms^(-1)...

    Text Solution

    |

  2. An object is acted on by a retarding force of 10 N and at a particular...

    Text Solution

    |

  3. By applying the brakes without causing skid, the driver of a car is ab...

    Text Solution

    |

  4. A bullet fired into a trunk of a tree loses 1//4 of its kinetic energy...

    Text Solution

    |

  5. A cradle is 'h' meters above the ground at the lowest position and 'H'...

    Text Solution

    |

  6. A stone of mass "m" initially at rest and dropped from a height "h" st...

    Text Solution

    |

  7. A particle moves with the velocity vec v = (5 vec i + 2 vec j - vec k)...

    Text Solution

    |

  8. A motor boat is going in a river with a velocity vec(V) = (4 hat i-2 h...

    Text Solution

    |

  9. Two riffles fire the same number of bullets in a givem interval of tim...

    Text Solution

    |

  10. A car weighing 1000 kg is going up an incline with a slope of 2 in 25 ...

    Text Solution

    |

  11. A crane can lift up 10,000 kg of coal in 1 hour form a mine of 180 m d...

    Text Solution

    |

  12. A man carries a load of 50 kg through a height of 40 m in 25 seconds. ...

    Text Solution

    |

  13. An electric motor creates a tension of 4500 newton in a hoisting cable...

    Text Solution

    |

  14. A juggler throws continuously balls at the rate of three in each secon...

    Text Solution

    |

  15. A bucket tied at the end of a 1.6m long string is whirled in a verticl...

    Text Solution

    |

  16. A body of mass 2 kg attached at one end of light string rotated along ...

    Text Solution

    |

  17. A pilot of mass m can bear a maximum apparent weight 7 times of mg. Th...

    Text Solution

    |

  18. The length of ballistic pendulum is 1 m and mass of its block is 0.98 ...

    Text Solution

    |

  19. A simple pendulum is oscillating with an angular amplitude 60^@. If ma...

    Text Solution

    |

  20. A body is moving in a vertical circle such that the velocities of body...

    Text Solution

    |