A particle is projected at an angle of e...

A particle is projected at an angle of elevation `alpha` and after t second it appears to have an elevation of `beta` as seen from the point of projection. Find the initial velocity of projection.

`(g t)/(2 sin (alpha-beta))`

`(gt cos beta)/(sin (alpha-beta))`

`(sin (alpha-beta))/(2g t) `

`(2 sin (alpha-beta))/(g t cos beta)`

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