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Precalculus
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OpenStudy (anonymous):
If a rock falls from a height of 90 meters on Earth, the height H (in meters) after x seconds is approximately H(x)=90 - 4.9x^2 . When does the rock strike the ground?
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OpenStudy (anonymous):
When H(x)=0, the rock hits the ground. Therefore, you want to solve 0=90-4.9x^2, or 90=4.9x^2. Does that help?
OpenStudy (anonymous):
yeah , tks :)
OpenStudy (anonymous):
:)
OpenStudy (anonymous):
can i ask u this ?
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