A particle is projected at an angle of elevation \[\alpha \] and after t seconds it appears to have an angle of elevation \[\beta \] as seen from point of projection. The initial velocity will be

\[\frac{\sin \left( \alpha -\beta \right)}{2gt}\]

\[\frac{gt}{2\sin \left( \alpha -\beta \right)}\]

\[\frac{gt\,\cos \beta }{2\sin \left( \alpha -\beta \right)}\]

\[\frac{2\sin \left( \alpha -\beta \right)}{gt\,\cos \beta }\]

A particle is projected at an angle of elevation \[\alpha \] and after

1.	A particle is projected at an angle of elevation \[\alpha \] and after t seconds it appears to have an angle of elevation \[\beta \] as seen from point of projection. The initial velocity will be
A.	\[\frac{gt}{2\sin \left( \alpha -\beta \right)}\]
B.	\[\frac{gt\,\cos \beta }{2\sin \left( \alpha -\beta \right)}\]
C.	\[\frac{\sin \left( \alpha -\beta \right)}{2gt}\]
D.	\[\frac{2\sin \left( \alpha -\beta \right)}{gt\,\cos \beta }\]
Answer» C. \[\frac{\sin \left( \alpha -\beta \right)}{2gt}\]