Energy Conservation with Conservative Forces: a Small Hockey Puck Slides

Energy conservation with conservative forces: A small hockey puck slides without friction over the icy hill shown in the figure and lands 6.20 m from the foot of the cliff with no air resistance. What was its speed v₀ at the bottom of the hill?

A) 20.8 m/s
B) 17.4 m/s
C) 14.4 m/s
D) 13.7 m/s
E) 4.71 m/s