일반물리학 1 — Center of Mass and Linear Momentum: Problem 10

10 A 1000 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 \(3.0 \text{ m/s}^2\). At the same instant a 2000 kg truck, traveling at a constant speed of \(8.0 \text{ m/s}\), overtakes and passes the automobile. (a) How far is the com of the automobile–truck system from the traffic light at \(t = 5.0 \text{ s}\)? (b) What is the speed of the com then?