A 1250 kg automobile is at rest at a traffic signal. At the instant the light turns green, the automobile starts to move with a constant acceleration of 3.3 m/s2. At the same instant a 1800 kg truck, traveling at a constant speed of 9.4 m/s, overtakes and passes the automobile. (a) How far is the center of mass of the automobile-truck system from the traffic light at t = 3.2 s? (b) What is the speed of the center of mass of the automobile-truck system then?

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