Acceleration is a physical quantity that measures the rate of change of an object's velocity. It is defined as the change in velocity divided by the change in time.
Acceleration can be calculated by dividing the change in an object's velocity by the change in time. The formula is: a = (v2-v1)/t, where a is acceleration, v2 is the final velocity, v1 is the initial velocity, and t is the change in time.
The units of acceleration are typically measured in meters per second squared (m/s^2) in the metric system, or feet per second squared (ft/s^2) in the imperial system.
Velocity measures the rate of change of an object's displacement, while acceleration measures the rate of change of an object's velocity. In simpler terms, velocity tells you how fast an object is moving, while acceleration tells you how much an object's speed is changing.
Acceleration can be positive or negative depending on the direction of an object's motion. If an object is speeding up in the positive direction, its acceleration will be positive. If an object is slowing down in the positive direction, its acceleration will be negative. The opposite is true for motion in the negative direction.