If a particle is projected inside a horizontal tunnel which is 554 cm high with a velocity of 60 m per sec, the angle of projection for maximum range, is

If a particle is projected inside a horizontal tunnel which is 554 cm

1.	If a particle is projected inside a horizontal tunnel which is 554 cm high with a velocity of 60 m per sec, the angle of projection for maximum range, is
A.	8
B.	9
C.	10
D.	11
E.	12 .
Answer» D. 11