A: ### Quick Answer

**The equation for velocity is displacement divided by time.** The equations for speed and velocity are similar, but velocity must always have direction, whereas speed does not.

While speed is a measure of how fast something is moving, velocity is a measure of the rate an object changes its position. Distance is a measure of how far something is, while displacement is a measure of the shortest distance between an object's start point and its end point. For example, a runner who ran 400 meters around a track travelled a distance of 400 meters. However, he has a displacement of 0 because he ended up at the same place he started.

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## What is the equation for speed?

A:

Full Answer >**The most common equation for speed is: speed = distance / time.**It can also be expressed as the time derivative of the distance traveled. Mathematically, it can be written as v = s/t, or v = (ds/dt), where speed is denoted by v, distance is denoted by s, and time is denoted by t. In case of uniform velocity, the first equation is used.Filed Under: - Q:
## What is the free-fall equation?

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Full Answer >**The equation to calculate a free-falling object's velocity or time spent falling is velocity equals gravitational acceleration multiplied by time.**This occurs if three conditions are given: an initial velocity of zero, a hypothetical infinite space to fall in and negligible air resistance.Filed Under: - Q:
## Is velocity a vector?

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Full Answer >**Velocity is a vector since it is composed of a quantity of speed and a direction.**Velocity is defined as the rate at which an object's position changes.Filed Under: - Q:
## Can velocity be negative?

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Full Answer >**An object in motion has a negative velocity when the movement is in the negative direction relative to the observer.**Whether velocity is positive or negative only indicates the direction of the movement of an object.Filed Under: