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When a soccer ball is kicked with a vertical speed of 25 m/s its height, h metres, after t seconds is given by the equation h=-5t^2+25t

a) how long after it is kicked is the soccer ball at a height of 30 m ?

b) How long is the soccer ball in the air?

  • math -

    a)h=30, solve for t
    30=-5t^2+25t
    5(t^2-5t+6)=0
    5(t-3)(t-2)=0
    t=2 (ball going up) or
    t=3 (ball going down)

    b) h=0, solve for t
    0=-5t^2+25t
    5t(5-t)=0
    t=0 or t=5
    Make similar interpretations.

  • math -

    dde

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