Q: What instrument should be used to measure how fast a boy can run 100 meters?

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it is measured by an instrument called Anemometer

100 kilometers is a measure of length and distance, not speed. 100 km/h is a measure of speed, which is pretty fast.

The speed of an object is a measure of how fast it is moving. Speed is typically measured in distance units per time unit, such as meters per second.

Your speedometer! It tells you how fast you are going at that instant.All different types of devices are used to measure instantaneous velocity including chronographs, lasers, and radars.

faster than me

you can measure the density of plastic using an instrument called electronic densimeter. this densimeter give you the density measurements very easily and fast. below is few models of this instrument.http://www.worldtesters.com/Tester_Meters/Densimeters.htm

100:52kg x your height in meters squared

The measure of how fast an object is moving is its velocity. Velocity is a vector quantity that includes both the speed and direction of an object's motion. It is typically measured in units like meters per second (m/s) or kilometers per hour (km/h).

The measure of how fast or slow something is traveling is its speed. Speed is typically measured in units such as meters per second (m/s) or kilometers per hour (km/h).

Doesn't work like that. Meters per second is a measure of speed. 125 km is a distance. There's no direct comparison between the two. You might as well as how fast a mile is.

None. 50 kilometres is a measure of distance. Metres per hour is a measure of speed or velocity. The two measure different things and it makes no sense to try and convert one to the other. The question is like asking how fast is the length of your room!

4.5 meters in 9 second how fast in kilometer per hour?