问题标题:
第一个问已经做出来,求第二问最好带过程,Ifaballisthrownverticallyupwardfromtheroofofa32foottallbuildingwithavelocityof112ft/sec,itsheightinfeetaftertsecondsiss(t)=32+112t-16t^2.Whatisthemaximum
问题描述:
第一个问已经做出来,求第二问最好带过程,
Ifaballisthrownverticallyupwardfromtheroofofa32foottallbuildingwithavelocityof112ft/sec,itsheightinfeetaftertsecondsiss(t)=32+112t-16t^2.Whatisthemaximumheighttheballreaches?(228)
Whatisthevelocityoftheballwhenithitstheground(height0)求第二问过程
孙普男回答:
因s(t)=32+112t-16t^2=228-16*(t-7/2)^2所以当t=7/2时,达到最大值228因速度v(t)=V0+a*t=112+a*7/2=0,所以加速度a=-32又因落地时s(t)=0,所以t=(7+根号57)/2落地时v(t)=112-32*(7+...
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