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A 1500 kg automobile is at rest at a traffic signal. At the instant the light...

A 1500 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 6.0 m/s2. At the same instant a 2100 kg truck, traveling at a constant speed of 9.0 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 = 3.0 s?


(b) What is the speed of the center of mass of the automobile-truck system then?
  m/s

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