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After an head on elastic collision betwe...

After an head on elastic collision between two balls of equal masses, one is observed to have a speed of `3m//s` along the positive x-axis and the other has a speed of `2m//s` along the negative x-axis. What are the original velocities of the balls?

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The correct Answer is:
A, B, C
In elastic collision between two equal masses,velocities are interchanged.
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