Solve the problem.If a rock falls from a height of 20 meters on Earth, the height H (in meters) after x seconds is approximately H(x) = 20 - 4.9x2.When does the rock strike the ground? Round to the nearest hundredth, if necessary.
A. 2.02 sec
B. 4.08 sec
C. 0.83 sec
D. 0.91 sec
Answer: A
Mathematics
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+ 
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Mathematics