A red car and a green car, identical except for the color, move toward each othe

Question

A red car and a green car, identical except for the color, move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is at xr = 0 and the green car is at xg = 220 m. If the red car has a constant velocity of +20 km/h, the cars pass each other at x = 45.2 m, and if it has a constant velocity of +40 km/h, they pass each other at x = 77.6 m. (a) What is the initial velocity of the green car? (Indicate direction with the sign of your answer.) m/s (b) What is the acceleration of the green car? (Indicate direction with the sign of your answer.) m/s2

Explanation / Answer

initial velocity of green car = Vg . a) time = 45.2 / 5.55 = 8.144 sec Vg = (220-45.2) / 8.144 = 21.46 m/s b) time = 77.6 /11.11 = 6.98 sec Vg = (220-77.6) / 6.98 = 20.40 m/s

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