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Speed ​​formula - this is how you calculate it

Are you having problems dealing with the speed formula? Read here how to use it and how to calculate with it.

The speed formula

Often, for example at school, one uses the speed formula to calculate. It is made up of three variables.

  • "s" stands for the distance and usually has the unit meter or kilometer. The distance is the distance that has been covered. This path is covered in a certain time.
  • "t" stands for the time that is required to cover a certain distance (s). The unit of time is seconds (s) or hours (h). Caution: The symbol for the unit "second" is s - but s is also the symbol for the distance!
  • "v" stands for the speed. It has the unit kilometers per hour (km / h) or meters per second (m / s). It is calculated from the quotient of the other two variables s and t (v = s / t).

Calculation example

When calculating with the speed formula, two values ​​of the three variables are normally given and the third value can thus be calculated by rearranging.

  • If you have given the variables s and t, the result is v = s / t ("s by t").
  • If v and s are known, t = s / v ("s by v") is calculated.
  • If you know v and t, s = vxt ("v times t") is calculated.

For example, if one has the distance s = 10 m and the time t = 5 s, then v is calculated as follows:

  1. The speed is: v = s / t
  2. If you insert the values, the speed is: v = 10 m / 5 s
  3. After shortening the result: v = 2 m / s
  4. The speed v is 2 meters per second.
  5. If you want to have the speed v in kilometers per hour (km / h), you just have to multiply the obtained value by the factor 3.6. In this calculation, v = 7.2 km / h.
  6. If you get the value in kilometers per hour (km / h), but want it in the unit meters per second (m / s), you just have to divide the obtained value by the factor 3.6.

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