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=2vcosαg=12.8 min,t=\frac{2v\cos\alpha}g=12.8~min,t=g2vcosα=12.8 min,
h=(vcosα)22g=721 km.h=\frac{(v\cos\alpha)^2}{2g}=721~km.h=2g(vcosα)2=721 km.
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