Home
Class 12
PHYSICS
A balloonist release a ballast bag from ...

A balloonist release a ballast bag from a balloon rising at 40 ms at a time when the balloon is 100 m above the ground. If g = 10m/s2 then the bag reaches the ground in:

A

`16 s^(-1)`

B

18 s

C

10 s

D

20 s

Text Solution

Verified by Experts

The correct Answer is:
c
Here 100=`40t+(1)/(2)xx10xxt^(2)`
or `t^(2)-8t-20=0`
or `t=(8pmsqrt(64+80))/(2)=(8+12)/(2)=10s `
Promotional Banner

Topper's Solved these Questions

  • DESCRIPTION OF MOTION IN ONE DIMENSION

    MODERN PUBLICATION|Exercise Recent Competitive Question|12 Videos

  • DESCRIPTION OF MOTION IN ONE DIMENSION

    MODERN PUBLICATION|Exercise Revision Test|45 Videos

  • DESCRIPTION OF MOTION IN ONE DIMENSION

    MODERN PUBLICATION|Exercise Revision Test|45 Videos

  • CURRENT ELECTRICITY

    MODERN PUBLICATION|Exercise RECENT COMPETITIVE QUESTIONS|32 Videos

  • DESCRIPTION OF MOTION IN TWO AND THREE DIMENSION

    MODERN PUBLICATION|Exercise Revision TEST|36 Videos

Similar Questions

Explore conceptually related problems

A man in a balloon rising vertically with an acceleration of 4.9 ms releases a ball 2 second after the balloon is let go from the ground. The greatest height above the ground reached by the ball is:

A balloon is going upwards with a velocity of 20 m It releases a packet when it is at a height of 160 m from the ground. The time taken by the packet to reach the ground is

A ballon is ascending at 15ms^(-1) . A bag containing food is dropped from it when it is at a height of 500 m from the ground. Calculate the time it takes to reach the ground. (g=9.8ms^(-2))

A balloon is going vertically upward with a velocity of 15 ms^-1 . When it is at a height of 50 m above the ground a stone is gently dropped from it. The stone will reach the ground in time (take g = 10 ms^-2) :

A ladder 17 m long reaches a window of a building 15 m above the ground. The distance of the foot of the ladder from the building is?

A body is released from the top of a tower of height metre. It takes time T seconds to reach the ground. Where is the body at time T/2 seconds?

A girl of height 100 cm is walking away from the base of a lamp post at a speed of 1.9 m/s. If the lamp post is 5 m above the ground, find the length of her shadow after 4 seconds.

A body when released from the top of a tower of height h reaches the ground in time T. At what time it is at a height h/2 above the ground?

A ball is thrown upwards from the ground. It is at a height 100 m in upward and downward journeys at time t_1 and t_2 respectively. If g = 10 m/s^(2) , then the product of t_1 . t_2 is:

MODERN PUBLICATION-DESCRIPTION OF MOTION IN ONE DIMENSION -MULTIPLE CHOICE QUESTION (LEVEL-II)
  1. A ball falls on the surface from 10 m height and rebounds to 2.5 m. If...

    Text Solution

    |

  2. The acceleration a' in ms-2 of a particle is given by a = 3t^2 +2t+2, ...

    Text Solution

    |

  3. The x and y co-ordinates of a particle at any instant are x = 4t^2 + 7...

    Text Solution

    |

  4. Two stones are thrown from the top of a tower, one straight down with ...

    Text Solution

    |

  5. A lunar landing module is descending toward the moon's surface at a st...

    Text Solution

    |

  6. A car starts from rest and moves with constant acceleration. The ratio...

    Text Solution

    |

  7. A balloonist release a ballast bag from a balloon rising at 40 ms at a...

    Text Solution

    |

  8. Two bodies begin a free fall from the same height at a time interval o...

    Text Solution

    |

  9. A boy releases a hall from the top of a building. It will clear a wind...

    Text Solution

    |

  10. Two balls are projected simultaneously with the same speed from the to...

    Text Solution

    |

  11. A particle travels half the distance with a velocity of 6 ms. The rema...

    Text Solution

    |

  12. A body starts from a point with a velocity and uniform acceleration a....

    Text Solution

    |

  13. The greatest acceleration or deceleration that a train may have is a. ...

    Text Solution

    |

  14. If the velocity of a car in increased by 20%, then the minimum distanc...

    Text Solution

    |

  15. The acceleration of a particle increasing linearly with timer is be. T...

    Text Solution

    |

  16. A ball is dropped vertically from a height above the ground. It hits t...

    Text Solution

    |

  17. A ball is released from the top of a tower of heighth metre. It takes ...

    Text Solution

    |

  18. A particle stars from rest. Its acceleration (a) versus time (t) is as...

    Text Solution

    |

  19. The velocity of particle is v=v0 +gt+ft^(2) if its position is x =0 at...

    Text Solution

    |

  20. An object moving with a speed of 6.25 m/s , is decelerated at a rate g...

    Text Solution

    |