飞机着陆后滑行的距离s与滑行时间t的二次涵数为s=60t-1.5t^2着陆后滑行多远停下?

问题描述:

飞机着陆后滑行的距离s与滑行时间t的二次涵数为s=60t-1.5t^2着陆后滑行多远停下?

S最大值即滑行距离 S=60t-1.5t =-1.5(t-40t+400-400) =-1.5(t-20)+600 当t=20s时,S=600m