How does a smartphone track speed?
In: 3
They have GPS and as a result they can log it’s position on Earth to within a few meters over and over all while running a clock on the whole process.
Distance divided by time equals speed (velocity).
To further refine and perfect the readings, phones can use their advanced sensors (gyros and accelerometers) to detect much smaller changes in the device’s relative speed that it can integrate to give a more precise instantaneous reading.
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