Acceleration is the rate of change of an object's velocity over time. It is a measure of how much an object's speed is increasing or decreasing per unit of time.
The formula for acceleration is a = (vf - vi)/t, where a is acceleration, vf is final velocity, vi is initial velocity, and t is time.
Acceleration is typically measured in meters per second squared (m/s²) or feet per second squared (ft/s²). It can be measured using tools such as accelerometers or by analyzing an object's change in position over time.
Examples of acceleration include a car speeding up, a ball falling towards the ground, and a rocket launching into space. In each of these cases, the velocity of the object is changing over time, resulting in acceleration.
Velocity is a vector quantity that describes both the speed and direction of an object, while acceleration is a vector quantity that only describes the rate of change of an object's velocity. In other words, acceleration tells us how quickly an object's velocity is changing, while velocity tells us how fast and in which direction an object is moving.