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Two identical balls “A” and “B” having velocities of $0.5 {ms}^{- 1}$ and $- 0.3 {ms}^{- 1}$ respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be:

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$0.3 m / s and 0.5 m / s$

$0.5 m / s and - 0.3 m / s$

$- 0.5 m / s and 0.3 m / s$

$- 0.3 m / s and 0.5 m / s$

answer is C.

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Detailed Solution

Masses of the balls are same and collision is elastic, so their velocity will be interchanged after collision.

$∴ v_{A} = u_{B} = - 0.3 m s^{- 1} and v_{B} = u_{A} = 0.5 m s^{- 1}$

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