Ug = mgh
m  ·  mass 20.0 kg
h  ·  height 18.0 m
x  ·  position 0%
PE = mgh 3528.0 J
100%
KE = ½mv² 0.0 J
0%
Emech = PE + KE 0.0 J
v = √(2KE/m) 0.00 m/s
g = 9.8 m/s² · frictionless