The ceiling of a hall is `30 m` high. A ball is thrown with `60 ms^(-1)` at an angle `theta`, so that it could reach the ceiling of the hall and come back to the ground. The angle of projection `theta` that the ball was projected is given by
Options:
(a) `sin theta =1/sqrt8`
(b) `sin theta =1/sqrt8`
(c) `sin theta =1/sqrt8`
(d) None of these