2.如圖,在6×8的網(wǎng)格紙中,每個(gè)小正方形的邊長(zhǎng)都為1,動(dòng)點(diǎn)P,Q分別從點(diǎn)F,A出發(fā)向右移動(dòng),點(diǎn)P的運(yùn)動(dòng)速度為每秒2個(gè)單位,點(diǎn)Q的運(yùn)動(dòng)速度為每秒1個(gè)單位,當(dāng)點(diǎn)P運(yùn)動(dòng)到點(diǎn)E時(shí),兩個(gè)點(diǎn)都停止運(yùn)動(dòng).
(1)請(qǐng)你在圖1中,畫出2秒時(shí)的線段PQ;
(2)在動(dòng)點(diǎn)P,Q運(yùn)動(dòng)的過程中,△PQB能否成為等腰三角形?若能,請(qǐng)求出相應(yīng)的時(shí)間t;若不能,請(qǐng)說明理由.