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A football is kicked 66.6 meters. If the ball is in the air for 5.39 seconds, with what initial velocity was it kicked?

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    L=vₒ²•sin2α/g = 66.6
    t= 2vₒ•sinα/g = 5.39
    vₒ = t•g/2•sinα
    L=vₒ²•sin2α/g= t²•g²•2•sinα•cosα/g•4•sin²α= t²•g/2•tanα
    tanα = t²•g/2•L
    α= arctan t²•g/2•L = arctan (5.39²•9.8/2•66.6)=64.9°.
    vₒ = t•g/2•sinα=5.39•9.8/2•sin 64.9°=...

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