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A particle of mass m collides with a sta...

A particle of mass m collides with a stationary particle and continues to move at an angle of `45^(@)` with respect to the original direction . The second particle also recoils at an angle of `45^(@)` to this direction . The mass of the second particle is (collision is elastic )

A

m

B

`sqrt2 m `

C

`(m)/(sqrt2)`

D

`(m)/(2)`

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