A smooth square plateform ABCD is moving...

A smooth square plateform ABCD is moving towards right with a uniform speed v. At what angle `theta` must a particle be projected from A with speed u so that it strikes the point B

`sin^(-1)((u)/(v))`

`cos^(-1)((v)/(u))`

`cos^(-1)((u)/(v))`

`sin^(-1)((v)/(u))`

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