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A particle of 1g moving with a velocity ...

A particle of 1g moving with a velocity of `6 cm *s^(-1)` collides elastically with a stationary particle of mass 2g , and is deflected throgh an angle of `90^@` . Find out
(i) the velocity of the 1g particle , and

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The correct Answer is:
`2sqrt(3) cm*s^(-1)`
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