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A 1000 kg automobile is at rest at a tra...

A 1000 kg automobile is at rest at a traffic signal. At the instant the light turns green, the auto mobile starts to move with a constant acceleration of `3.0 m//s^2`. At the same instant a 2000 kg truck, traveling at a constant speed of 8.0 m/s, overtakes and passes the automobile. (a) How far is the com of the automobile-truck system from the traffic light at t = 5.0 s? (b) What is the speed of the com then?

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The correct Answer is:
(a)39 m ; (b) 10 m/s
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