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. 0^o
B. 30^o  
C. 45^o
D. 60^o
E. 90^o

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Correct Answer: B