question_answer

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)        \[60{}^\circ \]