👉 In physics, speedfulness refers to a property of an object or system that indicates how quickly it moves. Speed is defined as the rate at which an object changes its velocity over time. The term "speedfulness" refers to the ability of an object or system to change its velocity efficiently and quickly, often measured in units such as meters per second (m/s) or kilometers per hour (km/h). This property can be used to describe various phenomena, including the speed at which a car acceler