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When a stuff 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?
Give your answer to the nearest tenths.
Give your answer to the nearest tenths.
1.3 显示答案
以上解析由 考满分老师提供。
