Difference between constant speed and velocity?

Answer 1

Answer #1:

Constant speed is a speed that is maintained and stays the same.

Instantaneous speed is a speed that goes up momentarily and then

comes back down.

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Answer #2:

A constant speed is one that has the same value now as it has had

at every previous time of interest, and the same as it will be for every

future time of interest.

An instantaneous speed is one that conveys no information about any

previous or future speed, only about the speed 'right now'.

I just made this up on the fly. I think it's pretty good.

Answer 2

Average speed is the total distance traversed divided by the total time required to get there.

Instantaneous speed is the speed at an instant in time and can be viewed as the distance traversed divided by the traversal time as the traversal time is made arbitrarily small. It can be written as a derivative.

In particular, velocity is a vector quantity

\vec v = \frac {d \vec x}{dt}

where \vec x is the (vector) displacement.

A displacement vector is a vector describing the difference in location from one point to another. A resultant vector is a vector that results from adding or subtracting vectors. A resultant vector can also be a displacement vector.

Answer 3

Both are velocity functions. Instantaneous velocity is the derivative of the average velocity

* * * * *

They are both speed functions. Velocity is a vector related to speed but quite irrelevant in this context. An object rotating at a constant [angular] speed has a velocity that is continuously changing but that has no relevance.

Answer 4

Speed is how fast you are going. Velocity is how fast you are going and what direction you are headed in.

Answer 5

Speed is a scalar (Only has magnitude, no direction)

Velocity is a vector (Has magnitude and direction)

Answer 6

Constant speed has no acceleration, whereas changing speed does.