I am a little confused as to what the magnitude of acceleration is and what it means.

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Your question is kind of vague but I will try to respond. Acceleration is defined as the time rate of change of velocity. Since velocity has both magnitude and direction, so does acceleration. In other words, acceleration is a vector. The length of the vector is its magnitude. Its direction is the direction of the vector. So the magnitude of acceleration is the magnitude of the acceleration vector while the direction of the acceleration is the direction of the acceleration vector. This is, of course, true of all physical quantities defined as having a magnitude and a direction. As an example, if a car is traveling north and accelerating at a rate of 10 feet per second per second, then the magnitude of the acceleration is 10 feet per second per second and the direction of the acceleration is north. If the car was traveling south but accelerating at the same rate, then the magnitude of its acceleration vector would be the same but its direction would be south.