设：自由落体运动段的位移为h1后半段的位移为h2则：h1=1\2gt1^2h2=gt1t2-1\2at2^2h1+h2=224gt1-at2=5所以解得t1=5s t2=3.6s h1=125m h2=99mh3=1\2gt2^2=1\2*10*3.6^2=64.8mt=t1+t2=8.6s所以答:离地面高度最少为99m,...