A particle of mass m moving with a speed...

A particle of mass `m` moving with a speed `u` strikes a smooth horizontal surface at an angle `45^(@)`. The particle rebounds at an angle `phi` with speed `v`. If coefficient of restituion is `(1)/(sqrt(3))`, then angle `phi` is

`30^(@)`

`45^(@)`

`60^(@)`

`37^(@)`

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