posted by Kelly .
An object moves along the x axis, subject to the potential energy shown in Figure 8-24. The object has a mass of 1.8 kg, and starts at rest at point A.
(a) What is the object's speeds at point B, at point C, and at point D?
Your figure 8-24 in invisible to us. Whatever it is, I suggest that you use the law on conservation of energy.