Miles per hour (mph, mi/h)
Miles per hour (mph or mi/h) is the number of miles covered in one hour. It is the unit for road speeds in the United States and the United Kingdom, and 1 mph is exactly 0.44704 meters per second.
Millimeters per second (mm/s)
Millimeters per second (mm/s) is a unit of speed. One meter is equivalent to 1000 millimeters and this unit is the number of millimeters travelled in one second.