A university graduate standing on the ground fires a rocket into the atmosphere at a velocity of 4000 m/s at an angle of 20o to the vertical axis. Determine (g = 9.8 m/s2):
(a) The time of flight (3) (b) The maximum level
(a) the time of flight
"t=\\frac{2v_0\\sin\\theta}{g}""t=\\frac{2\\times 4000\\times \\sin70^\\circ}{9.8}=767\\:\\rm s"
(b) the maximum level
"H_{\\max}=\\frac{v_0^2\\sin^2\\theta}{2g}""H_{\\max}=\\frac{ 4000^2\\times \\sin^270^\\circ}{2\\times9.8}=7.2\\times 10^5\\:\\rm m"
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