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The speed of an object falling from a great height is measured in meters per second per second until it reaches terminal velocity (maximum downward speed).
Because if speed is measured in meters per second (m/s) and time is measured in seconds, the SI unit of acceleration is meters per second per second (m/s2). ^_^
Speed is distance divided by time. So : you could have meters per second, or meters per hour, etc.
Speed or acceleration
Speed is a quantity that is measured in meters per second.The previous answer, velocity, is technically incorrect.Velocity is a vector, which consists of a magnitude and a direction.Example: 10 meters per second northwest.Speed, however, is a scalar, and consists solely of a magnitude.Example: 10 meters per second.