Q.

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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a

sin-1uv

b

cos-1vu

c

cos-1uv

d

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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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.