Two identical balls one moves with $12 m / s$ and second is at rest , collides elastically .After collision velocity of seconds and first ball will be:

6 m / s, 6 m / s

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12 m / s, 12 m / s

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12 m / s, 0 m / s

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0 m / s, 12 m / s

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Solution

The correct option is D $0 m / s, 12 m / s$
in elastic collision energy and momentum remain constant
$e = 1$
so, it exchange their velocity
Hence,
$v_{1} = 0 a n d v_{2} = 12 m / s$
$∴$ option $D$ is correct answer.

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Two identical balls one moves with 12 m/s and second is at rest , collides elastically .After collision velocity of seconds and first ball will be:

The correct option is D 0 m/s, 12 m/sin elastic collision energy and momentum remain constante=1so, it exchange their velocityHence,v1=0andv2=12m/s∴ option D is correct answer.

Two identical balls one moves with $12 m / s$ and second is at rest , collides elastically .After collision velocity of seconds and first ball will be:

The correct option is D $0 m / s, 12 m / s$
in elastic collision energy and momentum remain constant
$e = 1$
so, it exchange their velocity
Hence,
$v_{1} = 0 a n d v_{2} = 12 m / s$
$∴$ option $D$ is correct answer.