Home
Class 11
PHYSICS
Accordingto a FIR in police station, car...

Accordingto a FIR in police station, car A wassittingat rest waiting for a red light at a crossing when it was hit by an identical car B from rear side. Bothcars had their hand brakes on, and from their skid marks it is surmised that they skidded together about `6`m in the oriinal directionof travel before coming to reat. Assuming a stopping force of about `0.7` times the combined weights of the cars (that is, `mu=0.7`) what must have been the approximate speed of car B just before the collision ?

Text Solution

Verified by Experts

The correct Answer is:
`"["18.1m//s"]"`
Promotional Banner

Topper's Solved these Questions

  • LINEAR MOMENTUM & ITS CONSERVATION

    PHYSICS GALAXY - ASHISH ARORA|Exercise exercise 1.3|3 Videos

  • LINEAR MOMENTUM & ITS CONSERVATION

    PHYSICS GALAXY - ASHISH ARORA|Exercise Advance McQ|20 Videos

  • KINEMATICS

    PHYSICS GALAXY - ASHISH ARORA|Exercise Unsolved Numerical Pro.|83 Videos

  • NEWTONS LAWS OF MOTION

    PHYSICS GALAXY - ASHISH ARORA|Exercise Unsolved Numerical Problem|81 Videos

Similar Questions

Explore conceptually related problems

According to a FIR in police station, car A was at rest waiting for a red light at a crossing when it was hit by similar car B from rear side. Both cars had then hard brekes on, and from their skid marks it is surmiesed that they skidded together about 8m in the original direction of travel before coming to rest. Assuming a stopping force of about 0.4 times the combined weights of the cars. the speed of car B just before the collision is approximately [g=10 m//s^(2)]

The brakes of a car moving at 20 m/s along a horizontal road are suddenly applied and it comes to rest after travelling some distance if the coefficient of friction between the tyres and the road is 0.90 and it is assumed that all four tyres behave identically, the shortest distance the car would travel before coming to a stop is

A car starts from rest in a circular flat road of radius R with an acceleration a. The friction coefficient between the road and the tyred is mu Find the distance car will travel before is start skidding.

Sunset is red because at that time the light coming from the sun has to travel :

A car is travelling at 30 km/h in a circle of radius 60 m. What is the minimum value of mu_(s) for the car to make the turn without skidding ?

Most of the skid mearks left at the scence of an automobile accident are left by the car tires after the collision occurs. How can measuring the direction and length of these skid marks. After the collision reveal whether either of the cars involved was speeding before the collision?

A car is travelling at 20 m/s along a road. A child runs out into the road 50 m ahead and the car driver steps on the brake pedal. What must the car's deceleration be if the car is to stop just before it reaches the child ?

2A car of 1000 kg moving with a velocity of 18 km//hr is stopped by the brake force of 1000 N. The distance covered by it before coming to rest is -

In the "before" part of Fig., car A (mass 1100 kg) is stopped at a traffic light when it is rear-ended by car B (mass 1400 kg). Both cars then slide with locked wheels until the frictional force from the slick road (with a low mu_k of 0.10) stops them, at distances d_A = 8.2 m and d_B = 6.1 m. What are the speeds of (a) car A and (b) car B at the start of the sliding, just after the collision? (c) Assuming that linear momentum is conserved during the collision, find the speed of car B just before the collision. (d) Explain why this assumption may be invalid.

PHYSICS GALAXY - ASHISH ARORA-LINEAR MOMENTUM & ITS CONSERVATION-unsolved
  1. While moving in a wagon (5 kg)along a smoth road at 0.5 m/s, a 15 kg b...

    Text Solution

    |

  2. Two men, each of mass m, stand on the edge of a stationary buggy of ma...

    Text Solution

    |

  3. Accordingto a FIR in police station, car A wassittingat rest waiting f...

    Text Solution

    |

  4. A particle of mass M is at rest when it suddenly explodes into there p...

    Text Solution

    |

  5. Avertical, uniform chain of total mass M and length L is being lowered...

    Text Solution

    |

  6. A spring of free length 15 cm is connected to the two masses as shown ...

    Text Solution

    |

  7. A 441 gm bullet strikes an d becomes embedded in a 1.54 kg block of wo...

    Text Solution

    |

  8. A 4200 kg rocket is traveling in outer space with a velocity of 150 m/...

    Text Solution

    |

  9. The tennis ball may leave the racket of a top player on the serve with...

    Text Solution

    |

  10. A block of miss 2kg slides down a 30^(@) incline which is 3.6m high At...

    Text Solution

    |

  11. A rocket ejects a steady jet whose velocity is equal to u relative to ...

    Text Solution

    |

  12. Two billiard balls of equal mass move at tight angles and meet at the ...

    Text Solution

    |

  13. A cannon of mass M starts sliding freely down a smooth inclined plane ...

    Text Solution

    |

  14. A ball moving translationally collides elastically with another, stati...

    Text Solution

    |

  15. A flat car of mass m(0) starts moving to the right due to a constant h...

    Text Solution

    |

  16. A block of mass M with a semicircualr of radius R, rests on a horizont...

    Text Solution

    |

  17. Two balls having masses m and 2m are fastened to two light strings of ...

    Text Solution

    |

  18. Three identical discs A,B and C rest on a smooth horizonal plane as sh...

    Text Solution

    |

  19. A simple pendulum is supended from a peg on a verticl wall. The pendul...

    Text Solution

    |

  20. A block 'A' of mass 2m is placed on another block 'B' of mass 4m which...

    Text Solution

    |