8. A mass m slides down a frictionless loop-the-loop track shown in the diagram below. 171 4r a 6r If the mass is released from rest at point "a" and there is no appreciable air resistance, determine the speed of the mass at points b in terms of m, r, and g. A. vb = 4rg B. vb = √√4rg C. V = 8rg D. vb = √8rg E. V = √6rg
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