A partical of mass m moving with velocit...

A partical of mass `m` moving with velocity `1m//s` collides perfectly elastically with another particle of mass `2m`. If the incident particle is deflected by `90^(circ)`. The heavy mass will make and angle `theta` with the initial direction of `m` equal to:

`60^@`

`45^@`

`15^@`

`30^@`

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