Speedometer os the device which will accurately show the speed of a moving vehicle.As a science it can also be explained The distance between the two points should be measured at the time in which the distance has been covered then divide the number to get the speed in meter per second to get a accurate answer you can try these formula which we have learned in our school days.
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The term "speed" refers to how rapidly something is moving at any given moment. If you've ever glanced at a car's speedometer while it's driving, you've seen how speed is measured – the further the needle moves, the faster the car is going. A speedometer is a gadget that displays the speed of a moving vehicle correctly. It may also be explained as a science. To get an exact answer, measure the distance between any two places at the time when the distance was traveled, then divide the total to get the speed in meters per second using the method we learned in school.