Home
Class 11
PHYSICS
A ball is dropped from the top of a towe...

A ball is dropped from the top of a tower of height 78.4 m Another ball is thrown down with a certain velocity 2 sec later. If both the balls reach the ground simultaneously, the velocity of the second ball is

A

`29.4m//s`

B

`26.4m//s`

C

`30m//s`

D

`41.6m//s`

Text Solution

Verified by Experts

The correct Answer is:
A
Doubtnut Promotions Banner Mobile Dark
|

Similar Questions

Explore conceptually related problems

A ball is dropped from the roof of a tall building and simultaneously another ball is thrown horizontally with some velocity from the same roof. Which ball lands first? Explain your answer.

A ball is thrown from the top of a tower of 67 m high with a velocity 24.4 ms^(-1) at an clevation of 30^(@) above the horizontal. What is the distance from the foot of the tower to the point where the ball hits the ground?

Knowledge Check

  • A ball is thrown vertically upwards with a certain velocity. Then

    A
    during its upward motion work done by gravity is negative
    B
    during its downward motion workdone by gravity is positive
    C
    at the highest position work done by gravity is not defined.
    D
    during the complete motion workdone by the gravity is zero
  • A ball is dropped from a building of height 45 m. Simultaneously another ball is thrown up with a speed 40 m/s. The relative speed of the balls varies with time as

    A
    `t^(0)`
    B
    `t^(1)`
    C
    `t^(2)`
    D
    `(1)/(t)`
  • A ball is dropped from a building of height 45 m. Simultaneously another ball is thrown up with a speed 40 m/s. The relative speed of the balls varies with time as

    A
    `t^(0)`
    B
    `t^(1)`
    C
    `t^(2)`
    D
    `(1)/(t)`
  • Similar Questions

    Explore conceptually related problems

    A ball is dropped from a building of height 45 m. Simultaneously another ball is thrown up with a speed 40 m/s. The relative speed of the balls varies with time as

    A stone is dropped from a hill of height 180m. Two seconds later another stone is dropped from a point P below the top of the hill. If the two stones reach the ground simultaneously, the height of P from the ground is

    A stone is dropped from a hill of height 180m. Two seconds later another stone is dropped from a point P below the top of the hill. If the two stones reach the ground simultaneously, the height of P from the ground is

    A ball is thrown upwards with 10 m/s velocity after 1 sec, what is its height?

    A ball thrown horizontally with velocity v from the top of a tower of height h reaches the ground in t seconds. If another ball of double the mass is thrown horizontally with velocity 3v from the top of another tower of height 4h it reaches the ground in (seconds). In the above problem if the first ball reaches the ground at a horizontal distance d, the second ball reaches the ground at a horizontal distance