Name and surname: Darije Maricic, Dragan Rosa Title: Synchronization with the Energy Release in the Associated Flare Abstract We study the relationship between the acceleration of coronal mass ejections (CMEs) and the energy release in associated flares, employing a sample of 22 events in which the CME kinematics was measured from the pre-eruption stage to the post-acceleration phase. The data show a distinct correlation between the duration of the acceleration phase and the duration of the associated soft X-ray (SXR) burst rise. The upper limit to the CME peak acceleration and velocity is related to the SXR peak flux. In the majority of events the acceleration started earlier than the SXR burst, and it is usually prolonged after the SXR burst maximum. In about one half of events the acceleration phase is very closely synchronized with the fastest growth of the SXR burst. An additional one quarter of the events may be considered to be relatively-well synchronized, whereas in the remaining quarter of the events, there is a considerable mismatch.