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# Calculating Velocity?

How do you calculate velocity in physics?

### 2 Answers

- Anonymous1 month ago
The most common way is given by the ratio between a displacement and its relevant time

- NCSLv 71 month ago
There are many ways to calculate velocity, and the method you would use depends both on the information you have and the velocity you want.

For instance, if you have a displacement function x(t), the velocity function v(t) = dx/dt which can be evaluated at any t. And if you have the acceleration function a(t), you can integrate that to get v(t). In this case you need to have some boundary (e.g., "initial") condition.

If you have two position values at two different points in time, you can calculate the average velocity using Vavg = Δs/Δt.

If you have an initial velocity, a displacement and the acceleration over that displacement, you can find the final velocity using

v = √(u² + 2*a*s)

If you have an initial velocity and an acceleration over a specific time frame, you can find the final velocity using

v = u + a*t

Or you might know the kinetic energy of an object and its mass, in which case

v = √(2*KE / m)

Given a wavelength and its frequency, the velocity of the associated wave is

v = f*λ

Divide the momentum of an object by its mass: v = p / m.

Those are just a few examples.