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A large box is moving on a horizontal fl...

A large box is moving on a horizontal floor with constant acceleration a=g. A particle is projected inside box with velocity u and angle `theta` with horizontal from box frame. For the given u, the value of `theta` for which horizontal range inside he box will be maximum is

A

`theta=pi//4`

B

`pi//8`

C

`3pi//8`

D

`pi//3`

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