Two sprinters leave the starting gate at the same time at the beginning of a straight track. The masses of the two sprinters are 56 kg and 65.9 kg. a)A few seconds later, the first sprinter is ahead of the second by a distance 5.5 m. How far ahead of the second sprinter is the center of mass of these two sprinters, in meters?  b) If the speeds of the sprinters are 4.5 m/s and 3.4 m/s, respectively, how fast, in meters per second, is the center of mass moving?  c) What is the momentum of the center of mass, in kilogram meters per second?  d) How is the momentum of the center of mass related to the total momentum of the sprinters?

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