A small diamond of mass 13.3 g drops from a swimmer's earring and falls through the water, reaching a terminal velocity of 2.1 m/s.   (a) Assuming the frictional force on the diamond obeys f = −bv, what is b (in kg/s)? (Round your answer to at least four decimal places.)  kg/s   (b) How far (in m) does the diamond fall before it reaches 90 percent of its terminal speed?  m

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