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BTGmoderatorLU
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When an object drops from a certain altitude, if the distance between it and the ground is \(H\) and the time it has been dropping is \(t\), \(H\) and t satisfy an equation: \(H=8-4.9t^2\). Then how long will it need to hit the ground?
A. \(1\)
B. \(1.2\)
C. \(1.3\)
D. \(2.4\)
E. \(2.6\)
The OA is C
A. \(1\)
B. \(1.2\)
C. \(1.3\)
D. \(2.4\)
E. \(2.6\)
The OA is C
