anonymous
  • anonymous
The height in meters of a projectile can be modeled by h = -4.9t^2 + vt + s where t is the time (in seconds) the object has been in the air, v is the initial velocity (in meters per seconds) and s is the initial height (in meters). A soccer ball is kicked upward from the ground and flies through the air with an initial vertical velocity of 4.9 meters per second. After how many seconds does it land approximately?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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terenzreignz
  • terenzreignz
When it lands, what height does it have?
terenzreignz
  • terenzreignz
Wrong way to phrase it... Let me rephrase.... How high is the ball when it lands?
anonymous
  • anonymous
4.9?

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More answers

terenzreignz
  • terenzreignz
When it lands, is it 4.9 meters above the ground?
anonymous
  • anonymous
i have no idea
anonymous
  • anonymous
what do i have to do to get the answer?
terenzreignz
  • terenzreignz
Start with that... find the height of the ball as soon as it lands. It just takes a little intuition and visualization :)
anonymous
  • anonymous
-16
terenzreignz
  • terenzreignz
So... when the ball lands, it is 16 meters underground?
anonymous
  • anonymous
yupp
anonymous
  • anonymous
or no 16
terenzreignz
  • terenzreignz
16 means when the ball lands, it is 16 meters above the ground (in mid-air). Does that seem reasonable?
anonymous
  • anonymous
no.
terenzreignz
  • terenzreignz
Then... what is reasonable? When the ball lands, its height is...?
anonymous
  • anonymous
5f
terenzreignz
  • terenzreignz
What's f?
anonymous
  • anonymous
didnt mean to put tht srry
terenzreignz
  • terenzreignz
Well... you mean to tell me that when the ball *lands* it is 5 meters above the ground, then?
anonymous
  • anonymous
omg!! i really dont kno
terenzreignz
  • terenzreignz
Think... meditate... :P Now... how high is the ball when it LANDS... how many meters above the ground is the ball when it LANDS...
anonymous
  • anonymous
hmmm 0?
terenzreignz
  • terenzreignz
Yes. Finally :P
anonymous
  • anonymous
yay!!!! that was easy lol
terenzreignz
  • terenzreignz
Of course, when the ball lands, it is on the ground. Thus, it is 0 meters above the ground.
terenzreignz
  • terenzreignz
0 is not the answer. -.-
terenzreignz
  • terenzreignz
that's just a stepping stone...
anonymous
  • anonymous
oh ok wat next?
terenzreignz
  • terenzreignz
We need v and s. We already have v, the initial velocity, 4.9
terenzreignz
  • terenzreignz
What's the initial height (s) ?
anonymous
  • anonymous
4.9^2
terenzreignz
  • terenzreignz
Are you guessing? I strongly advise against it... it's too risky.
terenzreignz
  • terenzreignz
And no, the initial height is not \(\ 4.9^2\)
anonymous
  • anonymous
ok thnx for your help ill do the rest by myself :) thnx
terenzreignz
  • terenzreignz
Are you sure? Well, if you're sure, post your answer here.

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