Home
Class 11
PHYSICS
An aeroplane is moving with a velocity u...

An aeroplane is moving with a velocity u. It drops a packet from a height h. The time t taken by the packet in reaching the ground will be

A

`sqrt(((2g)/(h)))`

B

`sqrt(((2u)/(g)))`

C

`sqrt(((h)/(2g)))`

D

`sqrt(((2h)/(g)))`

Text Solution

Verified by Experts

The correct Answer is:
D
The initial velocity of airoplane is horizontal. Hence, the vertical component of velocity of packet will be zero.
`therefore h=(1)/(2)g t^(2)`
`rArr t=sqrt((2h)/(g))`
Promotional Banner

Topper's Solved these Questions

  • MOTION IN A PLANE

    DC PANDEY ENGLISH|Exercise Check point 3.6|20 Videos

  • MOTION IN A PLANE

    DC PANDEY ENGLISH|Exercise Check point 3.7|15 Videos

  • MOTION IN A PLANE

    DC PANDEY ENGLISH|Exercise Check point 3.4|15 Videos

  • MOTION

    DC PANDEY ENGLISH|Exercise Medical entrances gallery|19 Videos

  • PROJECTILE MOTION

    DC PANDEY ENGLISH|Exercise Level - 2 Subjective|10 Videos

Similar Questions

Explore conceptually related problems

A helicopter rises from rest on the ground vertically upwards with a constant acceleration g. A food packet is dropped from the helicopter when is at a height h. The time taken by the packet to reach the ground is close to [ g is the acceeration due to gravity] :

A body is dropped from a height H. The time taken to cover second half of the journey is

A balloon is ascending at the constant rate of 9.8 m//sec at a height of 98 m above the ground a packet is dropped from it. If time taken by the packet to reach the ground is (1 + sqrt(3lambda))sec . Find lambda . (Use g = 9.8 m//s^(2) )

A ball is thrown upwards with a speed u from a height h above the ground.The time taken by the ball to hit the ground is

An iron ball and a wooden ball of the same radius are released from a height ‘ h ’ in vacuum. The time taken by both of them to reach the ground is

A balloon starts from rest from the ground and moves with uniform acceleration g/8. When it reaches a height h a ball is dropped from it. Find the time taken by the ball to reach the ground.

A wooden ball and an iron ball are dropped from the same height h in vaccum. If their radii are the same then the time taken by then to reach the ground are

A ball is thrown vertically upward with a velocity u from the top of a tower. If it strikes the ground with velocity 3u, the time taken by the ball to reach the ground is

An aeroplane moving horizontally with a speed of 720 km//h drops a food pocket, while flying at a height of 396.9 m . the time taken by a food pocket to reach the ground and its horizontal range is (Take g = 9.8 m//sec )

A balloon rises from rest on the ground with constant acceleration g / 8. A stone is dropped from the balloon when the balloon has risen to a height of (H). Find the time taken by the stone to reach the ground.

DC PANDEY ENGLISH-MOTION IN A PLANE-Check point 3.5
  1. If a stone is thrown up with a velocity of 9.8 ms^(-1), then how much ...

    Text Solution

    |

  2. A stone falls freely rest. The distance covered by it in the last seco...

    Text Solution

    |

  3. A stone is thrown vertically upwards with an initial speed u from the ...

    Text Solution

    |

  4. A body is thrown vertically upwards from A. The top of a tower . It re...

    Text Solution

    |

  5. A body is projected upwards with a velocity u. It passes through a cer...

    Text Solution

    |

  6. A helicopter rises from rest on the ground vertically upwards with a c...

    Text Solution

    |

  7. A particle (A) is dropped from a height and another particle (B) is th...

    Text Solution

    |

  8. A particle is dropped from top of tower. During its motion it covers (...

    Text Solution

    |

  9. A ball dropped from the top of a tower covers a distance 7x in the las...

    Text Solution

    |

  10. A body falls from a height h = 200 m (at New Delhi). The ratio of dist...

    Text Solution

    |

  11. A stone is thrown vertically upwards. When stone is at a height half o...

    Text Solution

    |

  12. When a ball is thrown up vertically with velocity v0, it reaches a max...

    Text Solution

    |

  13. A man in a balloon rising vertically with acceleration 4.9m//s ^(2) ...

    Text Solution

    |

  14. A body freely falling from the rest has velocity v after it falls thro...

    Text Solution

    |

  15. Two balls are dropped from heights h and 2h respectively from the eart...

    Text Solution

    |

  16. An aeroplane is moving with a velocity u. It drops a packet from a hei...

    Text Solution

    |

  17. For a particle moving along a straight line, the displacement x depend...

    Text Solution

    |

  18. The acceleration of a particle is increasing linearly with time t as b...

    Text Solution

    |

  19. The acceleration a in ms^-2 of a particle is given by a=3t^2+2t+2, whe...

    Text Solution

    |

  20. A particle is moving such that s=t^(3)-6t^(2)+18t+9, where s is in met...

    Text Solution

    |