Final answer:
The magnitude of acceleration is measured in meters per second squared, which denotes how much an object's velocity changes each second. It's a vector quantity that includes changes in speed or direction, or both.
Step-by-step explanation:
The magnitude of acceleration is measured in meters per second squared (m/s²). This unit expresses how much the velocity of an object changes in one second. Acceleration, being a vector, has both magnitude and direction. It can result from a change in speed or direction of the object's velocity, or both. For instance, an object accelerating uniformly from rest to a velocity of 10 m/s in 2 seconds would have an acceleration of 5 m/s². This magnitude can also be expressed as a multiple of 'g', where 'g' is the acceleration due to gravity on Earth's surface, approximately 9.8 m/s².