Figure 2-28 shows a red car and a green car that move towardeach other. Figure 2

Question

Figure 2-28 shows a red car and a green car that move towardeach other. Figure 2-29 is a graph of their motion, showing thepositions xg0 = 270 m andxr0 = -35 m at time t = 0.The green car has a constant speed of -20 m/s and the red carbegins from rest. What is the acceleration magnitude of the redcar?

Chapter 2, Problem 41

Figure 2-28 shows a red car and a green car that move towardeach other. Figure 2-29 is a graph of their motion, showing thepositions xg0 = 270 m andxr0 = -35 m at time t = 0.The green car has a constant speed of -20 m/s and the red carbegins from rest. What is the acceleration magnitude of the redcar?

Fig. 2-28
Problem 41.

Fig. 2-29

Explanation / Answer

first find the position where they meet using the data of thegreen car: .    final position = init pos + vel* time = 270   - 20 * 12 =   30 . Then for the red car... .    final pos = init pos  +    init vel * time + (1/2) at2 .      30   =  -35    +    0   +   (1/2) a * 122 .          65   =   72 a .         a =   0.903 m/s2    is the acc of the redcar .          65   =   72 a .         a =   0.903 m/s2    is the acc of the redcar

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