Question

Two friends Colby [mass mC = 34 kg] and Charlie [mass mCh = 42 kg] are avid swimmers. Colby is a master swimmer, while Charlie only swims recreationally. They both start on one side of pool (x = 0) at the same time (t = 0). The pool is separated into lanes along the “long course” so that the other end is at x = 50 m. Colby swims 2,500 m in 55 minutes; we assume that Colby and Charlie swim at constant speeds. a) Colby and Charlie “meet” for the second time when they are at x = 11 m after Colby makes two turns and Charlie makes only one turn. When [i.e., at what time] do Colby and Charlie meet?

b) Sketch the position vs. time graph for Colby and Charlie until they “meet” the second time.

c) How fast does Charlie swim?

d) Where do Colby and Charlie meet for the first time?

e) How long does Colby have to wait until Charlie finishes the total distance 2,500 m?

Answer 1

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