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## Homework Statement

Hi, i have a peculiar question after watching MIT lecture:http://ocw.mit.edu/courses/physics/...echanics-fall-1999/video-lectures/lecture-12/

What is the difference between the equation representing the drag force for a sphere: C(sub1)rv+C(sub2)r^(2)v^(2) and this drag force equation: (1/2)pv^(2)C(sub d)A