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OpenStudy (anonymous):
a rock breaks loose from a cliff and plunges toward the ground 400 feet below. The distance "d" that the rock falls in "t" seconds is given by the equation d=16t^2. how long does it take the rock to hit the ground??
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OpenStudy (anonymous):
everybody helppin each other but knowbody want to help me whats up with that
OpenStudy (anonymous):
the distance the rock has to travel to hit the ground is 400ft. 400 = 16 * t^2 divide both sides by 16 and take the square root.
OpenStudy (anonymous):
25=t^2
OpenStudy (anonymous):
5=t
OpenStudy (anonymous):
Yup. Don't forget your units!
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OpenStudy (anonymous):
5 seconds
OpenStudy (anonymous):
yep!
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