Answer
Please see the work below.
Work Step by Step
We know that the object is at rest at point A, so at point A it has only potential energy. But when it travels from point A to B, the potential energy is converted into kinetic energy and its speed increases. Traveling from B to C, it gains potential energy and loses kinetic energy. From C to D, it falls down and hence loses potential energy while kinetic energy (and hence speed) increases. From D to E, the potential energy increases and thus the kinetic energy and speed decrease.
