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Because velocity has a direction but speed does not. A vector has both a numerical value and a direction but a speed has only a numerical value and therefore it can't be represented by a vector.

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Q: Why is velocity a vector but speed is not?
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Related questions

Which is vector speed or velocity?

"Speed" is a scalar; "velocity" is a vector.


Which is a vector quantity speed or velocity?

velocity is a vector and speed is a scalar.


Is a vector quantity speed or velocity?

velocity is a vector and speed is a scalar.


What is a size of a velocity vector?

The size of the velocity vector is the speed.


How is velocity diffrent from speed?

Velocity is a vector, and so it has two components -- magnitude (speed) and direction. Speed is a scalar, and it is the magnitude of velocity, a vector.


How is velocity different that speed?

Velocity is a vector Speed is a scaler


Which out of acceleration age speed temperature and velocity are vector quantities?

All of those are vectors except 'speed'. Speed is the scalar magnitude of a velocity vector.


What does the velocity include that the speed does not?

Direction. Velocity is a vector, speed is a scalar.


What is the biggest difference between speed and velocity?

velocity is speed with direction; velocity is a vector and speed is a scalar


What is the Velocity of speed?

Velocity is the vector form of speed. It is the speed of an object in a specified direction.


Why speed is scalar while velocity is vector?

Speed is scalar (that is, without direction) and velocity is a vector (speed plus direction) by definition in physics.


Why is velocity a vector but not a speed?

Because velocity has a direction but speed does not. A vector has both a numerical value and a direction but a speed has only a numerical value and therefore it can't be represented by a vector.