Answer:
Speed is an expression of how fast an object moves. An object's speed is the total distance it travels in a certain amount of time. Units of speed include miles per hour (mph), centimeters per second (cm/sec or cm/s), meters per second (m/sec or m/s), or kilometers per hour (kph or km/hr). Measuring speed involves observing the distance an object travels and the amount of time elapsed and then calculating the speed from those observations by dividing distance by time.
