(Solved): physics 0. A mass m slides down a frictionless loop-the-loop track shown in the diagram below. If t ...

0. A mass $$m$$ slides down a frictionless loop-the-loop track shown in the diagram below. If the mass is released from rest at point " $$\mathrm{a}$$ " and there is no appreciable air resistance, determine the speed of the mass at points $$d$$ in terms of $$m,r$$, and $$g$$. A. $$v_d=4rg$$ B. $$v_d=\sqrt{4rg}$$ C. $$v_d=8rg$$ D. $$v_d=\sqrt{8rg}$$ E. $$v_d=\sqrt{6rg}$$