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

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

5.0m/s

B

10 m/s

C

20m/s

D

40m/s

Text Solution

Verified by Experts

The correct Answer is:
C
`v = sqrt(2gh) = sqrt(2xx20xx10) = 20m//s`
Promotional Banner

Topper's Solved these Questions

  • MOTION IN ONE DIMENSION

    ERRORLESS|Exercise PAST YEARS QUESTIONS|26 Videos

  • MOTION IN ONE DIMENSION

    ERRORLESS|Exercise ASSERTION AND REASON|24 Videos

  • MOTION IN ONE DIMENSION

    ERRORLESS|Exercise NCERT BASED QUESTIONS (RELATIVE MOTION )|18 Videos

  • KINETIC THEORY OF GASES

    ERRORLESS|Exercise ASSERTION AND REASON |16 Videos

  • MOTION IN TWO DIMENSION

    ERRORLESS|Exercise ASSERTION & REASON|19 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 20 m . Height drops a stone. Assuming g = 10 ms^-2 towards north. The average acceleration of the body is.

A body is released from the top of a tower of height 50 m. Find the velocity with which the body hits the ground. (g=9.8m//s^(2))

A stone is thrown horizontally with velocity g ms^(-1) from the top of a tower of height g metre. The velocity with which it hits the ground is ("in" ms^(-1))

A particle is dropped from the top of a tower of height 80 m . Find the time of jurney and the speed with which it strikes the ground.

A stone is thrown upwards from the top of tower 85 m high , reaches the ground in 5 s. find (i) the greatest height it reaches above the ground (ii) the velocity with which it reaches the ground and (iii) the time taken to reach the maximum height . Take g = 10ms ^(-2) ?

A ball is dropped from a height of 20 m and rebounds with a velocity which is 3/4 of the velocity with which it hits the ground. What is the time interval between the first and second bunces (g=10m//s^(2))

A body is dropped from the top of a tower. If its average velcoity when it reaches the ground, is 10 ms^(-1) and the time taken by it to reach the ground is 2s, the height of the tower is ______ m.

ERRORLESS-MOTION IN ONE DIMENSION-NCERT BASED QUESTIONS (MOTION UNDER GRAVITY )
  1. Three particles A, B and C are thrown from the top of a tower with the...

    Text Solution

    |

  2. A balloon is at a height of 81 m and is ascending upwards with a vel...

    Text Solution

    |

  3. A boy standing at the top of a tower of 20m of height drops a stone. A...

    Text Solution

    |

  4. Free fall of an object (in vacuum) is a case of motion with

    Text Solution

    |

  5. A body starts to fall freely under gravity. The distances covered by i...

    Text Solution

    |

  6. At t = 0, a stone of mass 10 gm is thrown straight up from the ground...

    Text Solution

    |

  7. Two identical metal spheres are released from the top of a tower after...

    Text Solution

    |

  8. A body dropped from a height h with an initial speed zero, strikes the...

    Text Solution

    |

  9. A stone is thrown with an initial speed of ' 4.9 ms^(-1)' from a brid...

    Text Solution

    |

  10. A body projected vertically upwards with a velocity u returns to the s...

    Text Solution

    |

  11. A body is dropped from a height h. If t1 and t2 be the times in coveri...

    Text Solution

    |

  12. A body is thrown vertically up from the ground. It reaches a maximum h...

    Text Solution

    |

  13. A particle is thrown vertically upwards. If its velocity at half of th...

    Text Solution

    |

  14. A body, thrown upwards with some velocity, reaches the maximum height ...

    Text Solution

    |

  15. A ball is dropped from top of a tower of 100 m height. Simultaneously ...

    Text Solution

    |

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

    Text Solution

    |

  17. A man drops a ball downside from the roof of a tower of height 400 met...

    Text Solution

    |

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

    Text Solution

    |

  19. The acceleration due to gravity on the planet A is 9 times the acceler...

    Text Solution

    |

  20. A balloon is rising vertically up with a velocity of 29 ms^(-1). A sto...

    Text Solution

    |