A body is projected at time t = 0 with a
velocity 'u' at an angle theta with the horizontal.
It hits the ground at time t = tf where tf is the
time of flight. The average velocity of the
body during the time interval t = 0 to t = tf is
u cos o
u sin o
u/2(1 + cos^2 theta)^1/2
u/2(1 + sin^2 theta)^1/2
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