22.如圖,△ABC中,∠ACB=90°,AC=6cm,BC=8cm.點(diǎn)P從A點(diǎn)出發(fā)沿A-C-B路徑向終點(diǎn)運(yùn)動(dòng),終點(diǎn)為B點(diǎn);點(diǎn)Q從B點(diǎn)出發(fā)沿B-C-A路徑向終點(diǎn)運(yùn)動(dòng),終點(diǎn)為A點(diǎn).點(diǎn)P和Q分別以1cm/s和x cm/s的運(yùn)動(dòng)速度同時(shí)開始運(yùn)動(dòng),兩點(diǎn)都要到相應(yīng)的終點(diǎn)時(shí)才能停止運(yùn)動(dòng),在某時(shí)刻,分別過P和Q作PE⊥l于E,QF⊥l于F
(1)如圖1,當(dāng)x=2時(shí),設(shè)點(diǎn)P運(yùn)動(dòng)時(shí)間為t s,當(dāng)點(diǎn)P在AC上,點(diǎn)Q在BC上時(shí),
①用含t的式子表示CP和CQ,則CP=
cm,CQ=
cm;
②當(dāng)t=2時(shí),△PEC與△QFC全等嗎?并說明理由;
(2)請(qǐng)問:當(dāng)x=3時(shí),△PEC與△QFC有沒有可能全等?若能,直接寫出符合條件的t值:若不能,請(qǐng)說明理由.