Velocity is a physical quantity that describes the rate of change of an object's position with respect to time. It is a vector quantity, meaning it has both magnitude (speed) and direction.
While velocity and speed both measure how fast an object is moving, velocity also takes into account the direction of motion, while speed does not. This means that two objects can have the same speed, but different velocities if they are moving in different directions.
Velocity is calculated by dividing the change in an object's displacement (final position - initial position) by the change in time. This can be represented by the equation v = Δx/Δt, where v is velocity, Δx is change in displacement, and Δt is change in time.
Velocity can be measured in various units, but some common ones include meters per second (m/s), kilometers per hour (km/h), and miles per hour (mph). These units all represent a distance traveled per unit of time.
Acceleration is the rate of change of an object's velocity with respect to time. This means that if an object experiences acceleration, its velocity will either increase or decrease over time. If the acceleration is in the same direction as the velocity, the object will speed up. If the acceleration is in the opposite direction, the object will slow down.