推荐回答（1个）
（1）0=1/2a1*t^2+a1*t^2-1/2a2*t^2;
解得a1:a2=1:3;
(2)VB=a1*t,VA=a2*t-a1*t,由（1），a1:a2=1:3,
故VB：VA=1:2。
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