Answer :

Final answer:

Acceleration is the rate of change of velocity in a certain direction, measured in m/s². It can be positive, resulting in increased velocity, or negative (deceleration), causing a decrease in velocity.

Explanation:

Based on the provided information, we can conclude that the acceleration of an object is the rate at which its velocity changes with time, and it is measured in m/s². The object's acceleration can have a positive or negative value depending upon the direction of the force applied. For instance, acceleration is positive when it results in an increase in velocity, while it's negative when it causes a decrease in velocity, often referred to as deceleration. Zero acceleration occurs when an object is at a constant speed or rest, and there's a constant acceleration of -9.8 m/s² in free falling objects due to gravity.

When an object is in constant motion or at rest, the acceleration would be 0 m/s². In the case of free falling objects near Earth's surface without air resistance, the acceleration is generally -9.80 m/s², which is referred to as acceleration due to gravity. Faster accelerations are possible too, for example, a race car or a rocket can reach accelerations exceeding 100 m/s². The negative accelerations such as -20 m/s² or -25 m/s² are often associated with scenarios wherein the object slows down or moves in an opposite direction to the force applied.

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