Two trains run around circular paths of equal radius R = 10 km in opposite directions. The faster one has its horizontal coordinate described by x = Rсos(2лt) with t in hours. The slower one has its horizontal coordinate described by x = Rcos(2лt/3). How many times do the trains pass each other during 20 round trips of the faster train if they leave the same station at the same time t = : 0? a. ( 20.0) O b. (6.67) c. (None of the other 4 answers) d. (0.942) e. ( 60.0)

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Projectile Motion