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October 24th, 2007, 11:18 AM   #11
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Hm.. Well, with t=10, the height comes up to 40m! So, I don't thing that's right! And another thing: haven't we gone back to the "wrong" equation? When t=0, h!=90..
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October 24th, 2007, 02:43 PM   #12
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Geez, and I thought I had it right. I'm a little more confused now...
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October 25th, 2007, 04:30 PM   #13
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Quote:
Originally Posted by milin
Hm.. Well, with t=10, the height comes up to 40m! So, I don't thing that's right! And another thing: haven't we gone back to the "wrong" equation? When t=0, h!=90..
The equation you suggested made more sense, but Jemelly decided to stick with h=-4.9t^2+42t+110, which gives h=110 when the ball is thrown from the 90 m cliff. Hence it's only logical for h(10) to be 40 when the ball is only 20 m above ground level.
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October 25th, 2007, 07:43 PM   #14
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I had to stick to h=-4.9t^2+42t+110 because that is what was printed on my handout from my teacher. Anyway, I turned it in today for better or worse.

Thanks for all your help!
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