SOLUTION: A football is kicked into the air. The height of the football model by h(t)=5t^2+16t+1, where h(t) is the height in meters and t is the time in seconds from its release. When will

Algebra ->  Systems-of-equations -> SOLUTION: A football is kicked into the air. The height of the football model by h(t)=5t^2+16t+1, where h(t) is the height in meters and t is the time in seconds from its release. When will       Log On


   



Question 1162215: A football is kicked into the air. The height of the football model by h(t)=5t^2+16t+1, where h(t) is the height in meters and t is the time in seconds from its release. When will the football first reach a height of 13 meters?
Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A football is kicked into the air. The height of the football model by h(t)=5t^2+16t+1, where h(t) is the height in meters and t is the time in seconds from its release. When will the football first reach a height of 13 meters?
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h(t)=5t^2+16t+1 = 13
Solve for t
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Notice that the football never comes back down.

Answer by ikleyn(52787) About Me  (Show Source):
You can put this solution on YOUR website!
.
A football is kicked into the air. The height of the football model by h(t)=5t^2+16t+1,
where h(t) is the height in meters and t is the time in seconds from its release.
When will the football first reach a height of 13 meters?
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To be accurate, your formula is INCORRECT.


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For similar problems, see the lessons
    - Problem on a projectile moving vertically up and down
    - Problem on an arrow shot vertically upward
    - Problem on a ball thrown vertically up from the top of a tower
    - Problem on a toy rocket launched vertically up from a tall platform

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Also,  you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this textbook under the topic "Projectiles launched/thrown and moving vertically up and dawn".


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