Time of flight of the football="3=\\dfrac{2u\\sin\\theta}{g}-----(i)"
"68=u\\cos\\theta \\times T"
"68=u \\cos\\theta \\times 3"
"u=\\dfrac{68}{3\\cos\\theta}--------(ii)"
From the equation (i) and (ii)
"3=\\dfrac{2\\times 68 \\sin\\theta}{3\\cos\\theta}"
"\\tan \\theta=\\dfrac{9}{138}"
"\\theta=3.731"
"68=u\\cos (3.7) \\times 3"
"u=\\dfrac{68}{3\\cos{3.7}} =\\dfrac{68}{0.99\\times 3}=22.89m\/sec"
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