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A target situated on a hill can be seen ...

A target situated on a hill can be seen from the foot at angle `alpha` above the horizontal .The distance of the target along the horizonal is R. if a shell is fired from the foot at an angle `beta` with the horizontal, find the velocity required for it to strike the target.

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The correct Answer is:
`sqrt((R g cos alpha)/(2sin (beta-alpha) cos beta))`
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