Physics

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A football is kicked at ground level with a speed of 17.9m/s at an angle of 39.0∘ to the horizontal. How much later does it hit the ground?

  • Physics -

    Vo = 17.9m/s[39o]
    Xo = 17.9*cos39 = 13.91 m/s.
    Yo = 17.9*sin39 = 11.26 m/s.

    Y = Yo + g*Tr = 0 @ max ht.
    11.26 - 9.8Tr = 0
    9.8Tr = 11.26
    Tr = 1.15 s. = Rise time.

    Tf = Tr = 1.15 s. = Fall time.

    Tr+Tf = 1.15 + 1.15 = 2.30 s. = Time to
    hit gnd.

  • Physics -

    2.30s

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