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A particle of mass m is projected from t...

A particle of mass m is projected from the ground with an initial speed `u_(0)` at an angle `alpha` with the horizontal. At the highest point of its trajectory, it makes a completely inelastic collision with another identical particle, which was thrown vertically upward from the ground with the same initial speed `u_(0)`. The angle that the composite system makes with the horizontal immediately after the collision is

A

`frac(pi)(4)`

B

`frac(pi)(4) + alpha`

C

`frac(pi)(4) - alpha`

D

`frac(pi)(2)`

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