Question

Figure 1 shows a red car and a green car that move toward each other. Figure 2 is a graph of their motion, showing the positions xg0 = 270 m and xr0 = -35.0 m at time t = 0 (time they intersect =12s). The green car has a constant speed of 20.0 m/s and the red car begins from rest. What is the acceleration magnitude of the red car?

Answer 1

if they intersect at t=12 sec, the green car traveled 20*12 m=240m
so the distance the red car travled in 12 sec is 305-240 m or 65m
distancered=vi+at=a*12 but that equals 65 m
a= 65/12 m/s^2'check my math

Answer 2

Figure 4: a moving car