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# Units of Speed There are many different units of speed, used in different countries for different things. For example, ships use knots, airplanes use Mach, and some countries use miles per hour or kilometers per hour. Scientists use the standard unit of metres per second (m/s). "Per" means "in...

# Units of Speed There are many different units of speed, used in different countries for different things. For example, ships use knots, airplanes use Mach, and some countries use miles per hour or kilometers per hour. Scientists use the standard unit of metres per second (m/s). "Per" means "in each." So, metres per second means the number of metres traveled in each second. # Calculating Speed Speed is calculated by dividing the total distance traveled by the total time. * number of metres travelled in each second = total distance travelled / total time * speed = total distance travelled / total time # Formula Triangle A formula triangle can be used to calculate distance, speed, or time. ``` distance ------- speed | | time ------- ``` # Worked Example **Question:** Marcus rides his bicycle at a speed of 4 m/s for 60s. How far does he go in this time? **Answer:** distance = speed × time = 4 m/s × 60 s = 240 m **Question:** Sofia is in a car traveling at a speed of 35 m/s. How long will the car take to travel 2100 m? **Answer:** time = distance / speed = 2100 m / 35 m/s = 60 s # Summary The equation for speed is: speed = distance / time