A 3.30-kg mass starts from rest at point A and moves along the x axis subject to the potential energy shown in the figure below

 

a. Determine the speed of the mass at points B, C, D.

b. Determine the turning points for the mass. (Select all that apply.)

   i. point A

   ii. point B

   iii. point C

   iv. point D

   v. point E

U 30 J A 25 J C 20 J 15 J 10 J 5J B D E X 2 m 4 m 6 m 8 m 10 m