SOLUTION: a soccer ball was kicked from the ground and its height in meters above ground is modeled by the function h(t)=-4.9t^2+19.6t where t represents the time in second after the ball i

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Question 376663: a soccer ball was kicked from the ground and its height in meters above ground is modeled by the function h(t)=-4.9t^2+19.6t where t represents the time in second after the ball is kicked how long is the ball in the air
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
h(t)=-4.9t^2+19.6t
h= 0 when it touches the ground
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-4.9t^2+19.6t=0
-4.9t^2=-19.6t
/-4.9t
t=-19.6t/-4.9t
t=4 seconds.
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As you will see from the graph the height is = 0 at t=4 seconds
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graph%28300%2C300%2C-1%2C5%2C-5%2C22%2C%28-4.9x%5E2%2B19.6x%29%29
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m.ananth@hotmail.ca