A) The horizontal velocity equals to:
"v_{hor}=v*\\cos{30^{\\circ}}=84*\\cos{30^{\\circ}}=73 m\/s"
B) The ball flight time:
"t_f=\\frac{2v_0*\\sin{30^{\\circ}}}{g}=\\frac{2*84*\\sin{30^{\\circ}}}{9.8}=8.57 s"
C) The maximum height:
"H=\\frac{(v_0*\\sin{30^{\\circ}})^2}{2g}=90 m"
D) The length of the flight is:
"L=v_{hor}*t_f=73*8.57=625.6 m"
E) According to the energy conservation principle, final velocity equals to the initial velocity:
"v_f=v_0=84 m\/s"
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