A classical mechanics problem by Srutarshi Chakrabarti

Classical Mechanics Level 2

Two balls are thrown from a cliff one vertically upward and the other downward with the same velocity. Which ball reach the ground with a faster velocity?

More info required. The second ball. The first ball Both the balls have same velocity.

Srutarshi Chakrabarti by Srutarshi Chakrabarti , 23, India

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2 solutions

Sravanth C.
Feb 10, 2015

As the 1st ball is thrown with a particular velocity upward from a certain height, it will attain the same velocity when it comes back.

i.e, the velocity of the 2nd ball will be the same as the 1st ball............

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I didnt read the questionproperly i got it wrong....but the explanation is this....... when ball2 reach maximum height the velocity is zero....then it drops down with same a =-10 m/s2 as ball one...so they both will attain same velocity.......correction to question...first ball is dropped..not thrown,,,,,question is flawed....if thrown the first ball will be faster

Zack Yeung - 6 years ago

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That is exactly what I thought it meant

Manu Mehta - 5 years, 10 months ago

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but they didnt change the question still ...

Zack Yeung - 5 years, 10 months ago
Adrian Peasey
Jun 17, 2015

Conservation of energy is the simplest way of solving this. Since both balls have the same initial gravitational potential and kinetic energy, and we are negating air resistance, at any arbitrary height they will both have the same speed.

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