A particle is projected with a certain velocity at an angle \[\alpha \] above the horizontal from the foot of an inclined plane of inclination \[30{}^\circ \]. If the particle strikes the plane normally then a is

\[30{}^\circ +\text{ta}{{\text{n}}^{-1}}\left( \frac{1}{2} \right)\]

\[30{}^\circ +\text{ta}{{\text{n}}^{-1}}\left( \frac{\sqrt{3}}{2} \right)\]

\[30{}^\circ +\text{ta}{{\text{n}}^{-1}}1\]

A particle is projected with a certain velocity at an angle \[\alpha \

1.	A particle is projected with a certain velocity at an angle \[\alpha \] above the horizontal from the foot of an inclined plane of inclination \[30{}^\circ \]. If the particle strikes the plane normally then a is
A.	\[30{}^\circ +\text{ta}{{\text{n}}^{-1}}\left( \frac{\sqrt{3}}{2} \right)\]
B.	\[30{}^\circ +\text{ta}{{\text{n}}^{-1}}\left( \frac{1}{2} \right)\]
C.	\[30{}^\circ +\text{ta}{{\text{n}}^{-1}}1\]
D.	\[60{}^\circ \]
Answer» B. \[30{}^\circ +\text{ta}{{\text{n}}^{-1}}\left( \frac{1}{2} \right)\]