Home
Class 12
PHYSICS
A stone is dropped from the top of a tow...

A stone is dropped from the top of a tower and travels 24.5 m in the last second of its journey. The height of the tower is

A

`320m`

B

`245m`

C

`180m`

D

`125m`

Text Solution

Verified by Experts

The correct Answer is:
D
A stone is ……….
`s_(n) - s_(n.2) = 80`
`[0xxn+(1)/(2)xx10xxn^(2)] - [0xx(n-2)+ (1)/(2)xx10(n-2)^(2)] = 80`
`n = 5`
height of tower `= S_(5)`
`= 0xx5+(1)/(2)xx10xx5^(2)=125`
Promotional Banner

Topper's Solved these Questions

  • TEST PAPERS

    RESONANCE ENGLISH|Exercise PART - II PHYSICS|106 Videos

  • SIMPLE HARMONIC MOTION

    RESONANCE ENGLISH|Exercise Advanced Level Problems|13 Videos

  • TEST SERIES

    RESONANCE ENGLISH|Exercise PHYSICS|130 Videos

Similar Questions

Explore conceptually related problems

A body dropped from top of a tower falls through 40 m during the last two seconds of its fall. The height of tower in m is ( g= 10 m//s^2)

A stone is dropped from the top of a tower. If it hits the ground after 10 seconds, what is the height of the tower?

A body dropped from the top of tower covers a distance 9 x in the last second of its journey, where x is the distance covered in the first second. How much time does it take to reach the ground.

A ball dropped from the top of a tower covers a distance 7x in the last second of its journey, where x is the distance covered in the first second. How much time does it take to reach to ground?.

A bolldropped from the top of a tower covers a distance 7x in the last second of its journey, where x is the distance coverd int the first second. How much time does it take to reach to ground?.

A particle is dropped from the top of a tower. It covers 40 m in last 2s. Find the height of the tower.

A stone thrown upward with a speed u from the top of a tower reaches the ground with a velocity 4u. The height of the tower is

A stone is thrown vertically upwards with an initial speed u from the top of a tower, reaches the ground with a speed 3 u . The height of the tower is :

If a stone dropped from the top of a tower travels half, of the height of the tower during last second of its fall, the time of fall is (in seconds)

A stone dropped from the top of a tower reaches the ground in 3 s. The height of the tower is

RESONANCE ENGLISH-TEST PAPERS-PHYSICS
  1. Two particles are intially at a separation of d to each other. They mo...

    Text Solution

    |

  2. A stone is dropped from the top of a tower and travels 24.5 m in the l...

    Text Solution

    |

  3. An object has a velocity, v = (2hati + 4hatj) ms^(-1) at time t = 0s. ...

    Text Solution

    |

  4. Position of a point object is given by x = (2)/(3)t^(3) - 4t^(2)+6t+7 ...

    Text Solution

    |

  5. A body covers a distance of 4 m in 3^(rd) second and 12m in 5^(th) sec...

    Text Solution

    |

  6. A particle is moving along a circle of radius R with a uniform speed v...

    Text Solution

    |

  7. If vecA , vecB and vecC are mutually perpendiculasr (no zero vectors) ...

    Text Solution

    |

  8. A particle moving in a straight line covers half the distance with a s...

    Text Solution

    |

  9. Two particles of mass m and 2m have their position vectors as a functi...

    Text Solution

    |

  10. Two vectors vecA and vecB have magnitude in the ratio 1:2 respectivel...

    Text Solution

    |

  11. For an object, graph of (1)/(v) and x is as shown in figure, where v i...

    Text Solution

    |

  12. In a car race, car A takes a time t less than car B at the finish and ...

    Text Solution

    |

  13. The displacement of a particle a duntion of time is showm in figure. I...

    Text Solution

    |

  14. A bal is thrown vertically upwards from the ground. It crosses a point...

    Text Solution

    |

  15. int(0)^(pi//4) e^(x) (tan x+ sec^(2)x) dx

    Text Solution

    |

  16. A particle starts to move along a straight line. The acceleration vers...

    Text Solution

    |

  17. A semicircle of radius R = 5m with diameter AD as shown in figure. Two...

    Text Solution

    |

  18. A balloon is moving along with constant upward acceleration of 1 m//s^...

    Text Solution

    |

  19. If vecAxxvecB=vecC, then choose the incorrect option : [vecA and vecB ...

    Text Solution

    |

  20. A particle has an initial velocity of 9 m//s^(2) due east and a cons...

    Text Solution

    |