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Newton's First Law of Motion:
An object at rest will stay at rest; an object in motion will stay in motion with the same speed and direction, unless acted upon by an unbalanced force.
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The phrase in the absence of unbalanced forces means that the individual forces acting upon the object are balanced. Since the forces are balanced, the object's motion is described clearly by Newton's first law of motion (stated above).
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Definition of Accelerate:
An object that is said to accelerateis an object that is changing its velocity. The velocity of an object is the speed with a direction. There are three ways to change the velocity: to speed up, to slow down, and to turn or change direction.
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