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

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sin-1uv

cos-1vu

cos-1uv

sin-1vu

answer is B.

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Detailed Solution

When the relative velocity along horizontal will be zero, ie, ucosθ=v cosθ=vu

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