A university graduate standing on the ground fires a rocket into the atmosphere at a velocity of 4000 m/s at an angle of 20 degrees to the vertical axis. Determine (g = 9.8 m/s2):
(a) The time of flight
(b) The maximum level
"t=\\frac{2v\\cos\\alpha}g=12.8~min,"
"h=\\frac{(v\\cos\\alpha)^2}{2g}=721~km."
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