Home
Class 12
PHYSICS
A stone dropped from a building takes 4 ...

A stone dropped from a building takes 4 s to reach the ground. The height of the building is

A

`78.4` m

B

`64` m

C

`260` m

D

`2000` m

Text Solution

Verified by Experts

The correct Answer is:
A
`x=(1)/(2)"gt"^(2)`
`=(1)/(2)xx9.8xx(4)^(2)`
`=4xx9.8xx2`
`=9.8xx8`
`=78.4` m
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • MOTION IN A STRAIGHT LINE

    PHYSICS WALLAH|Exercise NEET Past 5 Years Questions|5 Videos

  • MOTION IN A STRAIGHT LINE

    PHYSICS WALLAH|Exercise NEET Past 5 Years Questions|5 Videos

  • MOTION IN A PLANE

    PHYSICS WALLAH|Exercise NEET Past 5 years Questions|10 Videos

  • MOVING CHARGES AND MAGNETISM

    PHYSICS WALLAH|Exercise NEET PAST 5 YEARS QUESTIONS |12 Videos

Similar Questions

Explore conceptually related problems

A stone is dropped from the roof of a building takes 4s to reach ground. The height of the building is

A stone dropped from top of a building reaches the ground in 7 seconds. The height of tower is ............... m (take g=10m/s^2)

Knowledge Check

  • A stone is dropped from roof of building takes 5 s to reach the ground. The sound of striking is heard after 5.4 second after the stone is dropped. The velocity of sound is

    A
    `312.5 ms^(-1)`
    B
    `332.5 ms^(-1)`
    C
    `352 ms^(-1)`
    D
    `392 ms^(-1)`

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

    A
    18.6 m
    B
    39.2 m
    C
    44.1 m
    D
    98 m

  • A stone is thrown downwards with velocity 10 m/s from the roof of a builng and it reaches the ground with speed 40 m/s. the height of the building would be

    A
    75 m
    B
    100 m
    C
    125 m
    D
    150 m

    • Similar Questions

    Explore conceptually related problems

    A stone falls from a building and reaches the ground 2.5 seconds later. How high is the building? (=9 .8 m//s^2)

    A body dropped from a height of 5m. Reaches the ground in 1 s. if it takes 2 s to reach the ground , find the height from which it is dropped.

    balloon is rising vertically up with a velocity of 29 m/s. A stone is dropped from it and it reaches the ground in 10 seconds. The height of the balloon when the stone was dropped from it is (g = 9.8 m/s^2)

    If a ball is thrown up with a velocity v from the top of a building the ball reaches the ground with a velocity 3u. Find the height of the building.

    A body is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about:-

    Home
    Profile