An object is projected with a velocity of 100 ms-1 from the ground level at an angle 0 to the vertical. If the total time of flight of the projectile is 10 s, calculate θ. (g = 10 ms-2).
-
A.
0o -
B.
30o -
C.
45o -
D.
60o -
E.
90o
Correct Answer: Option B
Explanation
T =
2u sinθg
sinθ =
Tg2u
=
10 x 102 x 100
= 0.5
,θ = sin-10.5 = 30o