Home
Class 11
PHYSICS
A lift is moving in upward direction wit...

A lift is moving in upward direction with speed `20m//s` and having acceleration `5m//s^(2)` in downward direction . A bolt drops from the ceiling of lift at that moment. Just after the drop , the `:`

A

velocity of bolt with respect to ground is zero

B

velocity of bolt with respect to ground is 20 m/s in upwards direction

C

acceleration of bolt with respect to ground is `5m//s^(2)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B

The velocity of an object released in a moving frame is equal to that of the frame as observed from the ground.
Promotional Banner

Topper's Solved these Questions

  • NUCLEAR PHYSICS

    RESONANCE ENGLISH|Exercise Exercise|35 Videos
  • PART TEST 2

    RESONANCE ENGLISH|Exercise Exercise|30 Videos

Similar Questions

Explore conceptually related problems

A lift of mass 1000kg is moving with an acceleration of 1m//s^(2) in upward direction. Tension developed in the string, which is connected to the lift, is.

A lift of mass 1000kg is moving with an acceleration of 1m//s^(2) in upward direction. Tension developed in the string, which is connected to the lift, is.

Assertion : A lift is ascending with decreasing speed means acceleration of lift is downwards. Reason : A body always moves in the direction of its acceleration.

A stone is thrown in a vertically upward direction with a velocity of 5 m//s . If the acceleration of the stone during its motion is 10 m//s^(2) in the downward direction, what will be the height attained by the stone and how much time will take to reach there ?

The mass of a lift if 600kg and it is moving upwards with a uniform acceleration of 2m//s^(2) . Then the tension in the cable of the lift is :

A lift, initially at rest on the ground, starts ascending with constant acceleration 8m//s^(2) After 0.5 seconds, a bolt falls off the floor of the lift. The velocity of the lift at the instant the bolt hits the ground is m/s .[Take g=10 m//s^(2) ]

An elevator (lift) ascends with an upward acceleration of 1.2ms^-2 . At the instant when its upward speed is 2.4 ms^-1 , a loose bolt drops from the ceiling of the elevator 2.7m above the floor of the elevator. Calculate (a) the time of flight of the bolt from the ceiling to the floor and (b) the distance it has fallen relaative to the elevator shaft.

A man of weight 80 kg is standing in an elevator which is moving with an acceleration of 6m//s^(2) in upward direction. The apparent weight of the man will be (g=10m//s^(2))

A a certain instant of time a ballon is moving downwards with speed of 5m/s. It has a constant retardation of 5m/s2. A man in the ballon drops a stone at that instant. It hits the ground after 2s. Then the speed with which the stone hits the ground is.

When lift is at rest f = f_(1) when lift is moving in upwards direction with decreasing velocity them f = f_(2) and when lift is accelerating upwards then f = f_(3 (Block is always at rest wrt lift). Identify correct option

RESONANCE ENGLISH-PART TEST 1-Exercise
  1. A solid sphere, a hollow sphere and a disc, all having same mass and r...

    Text Solution

    |

  2. Statetment-1: A solid sphere and a hollow spheres of same radius and s...

    Text Solution

    |

  3. A 1 kg block is being pushed against a wall by a force F=75N as shown...

    Text Solution

    |

  4. A forceF=(3thati + 5hatj)N acts on a body due to which its displacemen...

    Text Solution

    |

  5. Particle 'A' moves with speed 10 m/s in a frictionless circular fixed ...

    Text Solution

    |

  6. A metallic wire of diameter d is lying horizontally on the surface of ...

    Text Solution

    |

  7. Two constant horizontal force F1 and F2 are acting on blocks A and B. ...

    Text Solution

    |

  8. If the energy ( E) ,velocity (v) and force (F) be taken as fundamental...

    Text Solution

    |

  9. STATEMENT-1: Two spheres undergo a perfectly elastic collision. The ki...

    Text Solution

    |

  10. A shere of mass m , moving with velocity V, enters a hanging bag of sa...

    Text Solution

    |

  11. Each point mass 2 kg is connected at the end of each uniform rod of le...

    Text Solution

    |

  12. Reading of spring balance S1 and S2 (Pulley are ideal)

    Text Solution

    |

  13. A wheel of the radius 0. 4 m can rotate freely about its axis. A strin...

    Text Solution

    |

  14. A small ball of mass 1kg strikes a wedge of mass 4kg horizontally with...

    Text Solution

    |

  15. A lift is moving in upward direction with speed 20m//s and having acce...

    Text Solution

    |

  16. A body of mass m is released from a height h on a smooth inclined plan...

    Text Solution

    |

  17. A ball of mass m is fastened to a string. The ball swings in a vertica...

    Text Solution

    |

  18. If y=x-x^2 is the path of a projectile, then which of following is inc...

    Text Solution

    |

  19. Value of theta is increased gradually from theta = 0. At theta = tan^(...

    Text Solution

    |

  20. In the fig. (a) half of the meter scale is made of wood while the othe...

    Text Solution

    |