Home
Class 12
PHYSICS
A balloon starts rising from the ground ...

A balloon starts rising from the ground with an acceleration of `1.25ms^-2`. After 8 seconds, a stone is released from the balloon. After releasing, the stone will:

Text Solution

Verified by Experts

The correct Answer is:
C, D
`x=u(t-2)+a(t-2)^(2)`…(i)
`v=(dx)/(dt)=u+2a(t-2)`
Therefore `v(0)=u-4a`
`a=(d^(2)x)/(dt^(2))=2a" "` Hence [C]
`x(2)=0`[From (i)]. Hence [D]
Promotional Banner

Topper's Solved these Questions

  • MOTION IN A PALNE

    ALLEN |Exercise EXERCISE-03|6 Videos

  • MOTION IN A PALNE

    ALLEN |Exercise Assertion-Reason|20 Videos

  • MOTION IN A PALNE

    ALLEN |Exercise SOLVED EXAMPLE|28 Videos

  • KINEMATICS-2D

    ALLEN |Exercise Exercise (O-2)|47 Videos

  • NEWTON'S LAWS OF MOTION & FRICTION

    ALLEN |Exercise EXERCISE (JA)|4 Videos

Similar Questions

Explore conceptually related problems

A balloon starts rising from the ground with an acceleration of 1.25 m//s^(2) . A stone is released from the balloon after 10s. Determine (1) maximum height of ston from ground (2) time taken by stone to reach the ground

A balloon rises up with constant net acceleration of 10 m//s^(2) . After 2 s a particle drops from the balloon. After further 2 s match the following : ("Take" g=10 m//s^(2)) {:(,"Column I",,,"Column II"),((A),"Height of perticle from ground",,(p),"Zero"),((B),"Speed of particle",,(q),10 SI "units"),((C),"Displacement of Particle",,(r),40 SI "units"),((D),"Acceleration of particle",,(s),20 SI "units"):}

An object A is kept fixed at the point x= 3 m and y = 1.25 m on a plank p raised above the ground . At time t = 0 the plank starts moving along the +x direction with an acceleration 1.5 m//s^(2) . At the same instant a stone is projected from the origin with a velocity vec(u) as shown . A stationary person on the ground observes the stone hitting the object during its downward motion at an angle 45(@) to the horizontal . All the motions are in the X -Y plane . Find vec(u) and the time after which the stone hits the object . Take g = 10 m//s

A balloon of mass M is descending at a constant acceleration alpha . When a mass m is released from the balloon it starts rising with the same acceleration alpha Assuming that its volume does not change what is the value of m. ?

A balloon starts ascending from the ground at a constant speed of 25 m//s . After 5 s, a bullet is shot vertically upwards from the ground. (i) What should be the minimun speed of the bullet so that it may reach the balloon? (ii) The bullet is shot at twise the speed calculated in (i). Find the height at which it passes the balloon.

An object starting from rest undergoes an acceleration of 8ms ^(-2) for 10 second. Find (a) the speed (b) the distance travelled.

A body starts from rest and moves with a uniform acceleration of 10ms^(-2) for 5 seconds. During the next 10 seconds it moves with uniform velocity. Find the total distance travelled by the body (Using graphical analysis).

A bus starting from rest moves with a uniform acceleration of 0.1 ms ^(-2) for 2 minutes. Find (a) the speed acquiresd (b) the distance travelled.

ALLEN -MOTION IN A PALNE-EXERCISE-02
  1. The motion of a particle is described by the equation x = at^(2)+bt^(3...

    Text Solution

    |

  2. Initially a body is at rest. If its acceleration is 5ms^(-2) then the ...

    Text Solution

    |

  3. A balloon starts rising from the ground with an acceleration of 1.25ms...

    Text Solution

    |

  4. A body is thrown vertically upwards. If air resistance is to be taken ...

    Text Solution

    |

  5. A particle moves in east direction with 15m/sec for 2 sec then moves i...

    Text Solution

    |

  6. A 210 meter long train is moving due north at a of 25 m/s. a small bir...

    Text Solution

    |

  7. A force vecF=6t^(2)hati+4thatj is acting on a particle of mass 3 kg th...

    Text Solution

    |

  8. Starting from rest, the acceleration of a particle is a=2(t-1). The ve...

    Text Solution

    |

  9. Three different objects of masses m(1) , m(2) and m(2) are allowed to ...

    Text Solution

    |

  10. A ball is thrown upwards . Its height varies with time as shown in fig...

    Text Solution

    |

  11. A man walks on a straight road form his home to a market 2.5 km away w...

    Text Solution

    |

  12. A particle experiences a constant acceleration for 20 sec after starti...

    Text Solution

    |

  13. If a ball is thrown vertically upwards with speed u, the distance cove...

    Text Solution

    |

  14. A man throws balls with the same speed vertically upwards one after th...

    Text Solution

    |

  15. A stone falls freely such that the distance covered by it in the last ...

    Text Solution

    |

  16. The velocity of a particle is given by v=(5t^(2)-6t+5)m//s where t is ...

    Text Solution

    |

  17. Which of the following equation represents the motion of a body moving...

    Text Solution

    |

  18. The variation of velocity of a particle moving along a straight line i...

    Text Solution

    |

  19. Find the integration of the 1/(2x+1).

    Text Solution

    |

  20. The numerical ratio of displacement to the distance covered is always

    Text Solution

    |