A particle is projected with a certain velocity at an angle alpha abovethe horizonta form the foot of an inclined plane of inclination30^(@). If the particle strikes the plane normally thenalpha is equal to

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

1.	A particle is projected with a certain velocity at an angle alpha abovethe horizonta form the foot of an inclined plane of inclination30^(@). If the particle strikes the plane normally thenalpha is equal to
Answer» `30^(@)+tan^(-1) (SQRT(3)/2 )` `45^(@)` `60^(@)` `30^(@) +tan^(-1) 2sqrt(3)` Answer :A