How do I disable acceleration and deceleration of objects in motion?

Whenever I animate something moving from point A to B, it accelerates until it reaches the midpoint and then decelerates. This feature is horribly messing up my animations, how do I disable this feature?

In the graph editor select the handles of the keyframe and V / Vector or Key / Interpolation Mode / Linear menu
To set the default interpolation mode go to File / User Preferences / Editing panel and under the ‘New F-Curve Defaults’ change from Bezier to Linear. Then Ctrl+U to save these preferences

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