32 feet per second per second是什么意思

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• 32 feet per second per second是什么意思
• Suppose the fench at left field is 5 feet high and 230 feet from home plate.Determine a new slopevelocity is 120 feet per second,so that the softball will clear the fench by just three foot.formula= y= - 16（1＋s^2 ）*（x/v）^2＋sx＋4s=slopev=feet per secondy= height above the ground in feetx= distance on the ground from home plate in feetslope是多少y＝-16 (1+s^2)*(233/120)^2 + 233s +4 把230换成233 然后y＝0 那么slope的两个直是多少。
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