Home
Class 11
PHYSICS
A boy standing at the top of a tower of ...

A boy standing at the top of a tower of `20 m`. Height drops a stone. Assuming `g = 10 ms^-2` towards north. The average acceleration of the body is.

A

`20 m//s`

B

`40 m//s`

C

`5 m//s`

D

`10 m//s`

Text Solution

Verified by Experts

The correct Answer is:
A
We have `v = sqrt(2 gh)`
=`sqrt(2 xx 10 xx 20) = sqrt(400) = 20 ms^-1`.
Promotional Banner

Topper's Solved these Questions

  • GENERAL KINEMATICS AND MOTION IN ONE DIMENSION

    A2Z|Exercise AIIMS Questions|20 Videos

  • GENERAL KINEMATICS AND MOTION IN ONE DIMENSION

    A2Z|Exercise Chapter Test|30 Videos

  • GENERAL KINEMATICS AND MOTION IN ONE DIMENSION

    A2Z|Exercise Assertion Reasoning|20 Videos

  • FLUID MECHANICS

    A2Z|Exercise Chapter Test|29 Videos

  • GRAVITATION

    A2Z|Exercise Chapter Test|29 Videos

Similar Questions

Explore conceptually related problems

A boy standing at the top of a tower of 20 m height drops a stone. Assuming g = 10 ms^(-2) , the velocity with which it hits the ground is

A boy standing at the top of a tower of 2 m height drops a stone. Assuming g = 10 ms ^(-2), the velocity with which it hits the ground is

A boy standing at the top of a tower of 20m of height drops a stone. Assuming g=10ms^(-2) , the velocity with which it hits the ground is :-

A body is moving with velocity 30 m//s towards east. After 10 s its velocity becomes 40 m//s towards north. The average acceleration of the body is.

A boy is moving westward with a velocity of 10ms^(-1) . In 20 seconds , velocity changes to 5 ms^(-1) southwards . Calculate the average acceleration of the boy in this interval

A boy standing on the top of a tower of height 54 ft. throws a packet with a speed of 20 ft/s directly aiming towards his friend standing on the ground at a distance of 72 ft from the foot of the tower. The packet falls short of the person on the ground by x xx(16)/(3) ft. The value of x is

The angle of elevation of the top of a tower at a point G on the ground is 30^(@) . On walking 20 m towards the tower the angle of elevation becomes 60^(@) . The height of the tower is equal to :

A truck starts from rest and accelerate uniformly with 2 ms^(-2) . At t = 10 s a stone is dropped by a person standing on the top of the truck (6 m high from ground) . What are the (a) veloctiy and (b) acceleration of the stone at t = 11 s ? Neglect air resistance .

A2Z-GENERAL KINEMATICS AND MOTION IN ONE DIMENSION-NEET Questions
  1. The distance travelled by a particle starting from rest and moving wit...

    Text Solution

    |

  2. A particle shows distance-time curve as given in this figure. The maxi...

    Text Solution

    |

  3. A particle moves in a straight line with a constant acceleration. It c...

    Text Solution

    |

  4. A bus is moving with a speed of 10 ms^-1 on a straight road. A scooter...

    Text Solution

    |

  5. A particle starts its motion from rest under the action of a constant ...

    Text Solution

    |

  6. A ball is dropped from a high rise platform t = 0 starting from rest. ...

    Text Solution

    |

  7. A particle has initial velocity (3 hat i+ 4 hat j) and has acceleratio...

    Text Solution

    |

  8. A particle move a distance x in time t according to equation x = (t + ...

    Text Solution

    |

  9. A boy standing at the top of a tower of 20 m. Height drops a stone. As...

    Text Solution

    |

  10. A body is moving with velocity 30 m//s towards east. After 10 s its ve...

    Text Solution

    |

  11. A particle covers half of its total distance with speed v1 and the res...

    Text Solution

    |

  12. The motion of a particle along a straight line is described by equatio...

    Text Solution

    |

  13. A stone falls freely under gravity. It covered distances h1, h2 and h3...

    Text Solution

    |

  14. The displacement 'x' (in meter) of a particle of mass 'm' (in kg) movi...

    Text Solution

    |

  15. A particle of unit mass undergoes one-dimensional motion such that its...

    Text Solution

    |

  16. A particle moves so that its position vector is given by vec r = cos o...

    Text Solution

    |

  17. If the velocity of a particle is v = At + Bt^2, where A and B are cons...

    Text Solution

    |

  18. Two cars P and Q start from a point at the same time in a straight lin...

    Text Solution

    |

  19. Preeti reached the metro station and found that the escalator was not ...

    Text Solution

    |

  20. A toy car with charge q moves on a frictionless horizontal plane surfa...

    Text Solution

    |