Two balls A and B are thrown with same velocity u from top of a tower. Ball A is thrown vertically u

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2.Motion in Straight Line

medium

Two balls $A$ and $B$ are thrown with same velocity $u$ from the top of a tower. Ball $A$ is thrown vertically upwards and the ball $B$ is thrown vertically downwards.Choose the correct statement

Ball $B$ reaches the ground with greater velocity

Ball $A$ reaches the ground with greater velocity

Both the balls reach the ground with same velocity

Cannot be interpreted

Solution

The direction of motion while touching the ground will be vertically downwards, Now coming to the speed, Speed is nothing but a reflection of Kinetic energy of a body, More the kinetic energy more the speed. Taking the $ball-earth$ system, Mechanical energy is conserved,

Gain in Kinetic energy $=$ loss in potential energy

And as both the balls are at same height, Irrespective of the initial direction of throw, Both will lose same potential energy and gain the same Kinetic energy, Hence having the same velocity when they are near the ground.

option $C$ is the correct answer

Standard 11

Physics

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medium

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hard

(JEE MAIN-2021)

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medium

Two balls $A$ and $B$ are thrown with same velocity $u$ from the top of a tower. Ball $A$ is thrown vertically upwards and the ball $B$ is thrown vertically downwards.Choose the correct statement

Solution

Similar Questions

A ball is thrown vertically upwards with a veloctty of $20 \;\mathrm{m} \mathrm{s}^{-1}$ from the top of a multistorey building. The helght of the point from where the ball is thrown is $25.0\; \mathrm{m}$ from the ground. How high will the ball rise? Take $g=10 \;\mathrm{m} \mathrm{s}^{-2}$

An object start sliding on a frictionless inclined plane and from same height another object start falling freely

A body freely falling from the rest has a velocity $‘v’$ after it falls through a height $‘h’$. The distance it has to fall down for its velocity to become double, is

A stone is dropped into a pond from the top of the tower of height $h$. If $v$ is the speed of sound in air, then the sound of splash will be heard at the top of the tower after a time

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