Question

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

Answer 1

$t=\frac{2v\cos\alpha}g=12.8~min,$

$h=\frac{(v\cos\alpha)^2}{2g}=721~km.$