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A 1:7 kg mass starts from rest at point A and moves along the x axis subject to the potential energy shown in the figure below. PE 30 1 25 J 20 J C 15J D 10 1 5 J B 2m 4m 6m Sm 10m (a) Determine the speed of the mass at points B, C, D. point B 5.42 m/s point C 3.42 m/s point D 4.20 m/ (b) Determine the turning points for the mass. (Select all that apply.) point A point B point C O point D point E X