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Answered 2011-09-25 20:19:24

The car speedometer shows instantaneous speed.

-- It can't show average speed, because it doesn't know anything about

what your speed was at any time in the past, before this moment.

-- It can't show velocity, because it doesn't know anything about

the direction you're going.

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For the instantaneous value of average velocity, average speed and average velocity are equal.

the instantaneous velocity or speed is the speed a body travels at a particular and average velocity is the total distance an object

velocity is just a general term for speed (it could be average velocity or instantaneous velocity). Instantaneous velocity/speed (same thing) is the speed at that second. If you are familiar with calculus, it is the derivative of the position graph. Whereas average velocity is how fast the object is going in, for example, 1 hour, it is the speed that is maintained the whole hour (or the average) Instantaneous would be that at the second, at for example t=1.425, the speed is 24m/h . something along those lines

When the length of the time is decreased more and more ,average velocity of the particles equals instantaneous velocity.

Instantaneous speed is the magnitude of the velocity. Velocity also states the [direction] of the speed.

That is the case when you are talking about instantaneous speed and velocity - or when the velocity is constant. In the case of an average speed and velocity, this relation does not hold.

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.

BecuZ average is the same limit and the other is nesting velocity

Generally it is a Yes. Instantaneous velocity is the exact velocity at a particular time in the course of the movement. However, average velocity is the average of all the instantaneous velocity over a period of time. It is also known as speed in everyday life. As a result, the movement of an object over a time period under varying velocity denotes a varying instantaneous velocity which could be different from the average velocity. It is however, possible that the instantaneous velocity equates to the average velocity at a certain point over the duration of movement. For example, a ball is traveling at instantaneous velocity of 99m/s at t=1s , 100m/s at t=2s and 101m/s at t=3s. the average velocity over the 3s period is hence 100m/s which coincides with the instantaneous speed at t=2s.

It is the speed or velocity at a particular instant.

In that case, the average speed is the same as the instantaneous speed.

It reads instantaneous speed, and tells you nothing about average speed.

No. Speed can remain constant when velocity changes, but velocity can't remain constant when speed changes.

Yes. Velocity is speed and direction so it can change velocity by changing direction.

Speed, instantaneous or not, is a term used for how fast an object travels. Velocity, instantaneous or not, is a term used for how fast an object travels in a particular direction.

They are the same thing, however velocity is 'in a given direction', speed is in any direction.

"Velocity" is a vector quantity. This also applies to instantaneous velocity. If you want the scalar quantity, you talk about "speed".

Yes. For a start, this happens when the object moves at a constant velocity. Also, if moving in a straight line, even if the object changes speed there must needs be a moment when its instantaneous speed is equal to its average speed - since it cannot change speed suddenly, it must do so gradually.

Only if speed is constant. There can be no acceleration if the average speed is equal to the instantaneous speed.

Yes. In smooth linear motion, the average speed and the instantaneous speed are equal.

Instantaneous speed is what you see on your speedometer. Average speed is: how far you drove - divided by - how long it took.

Speed is a scalar quantity that refers to how fast an object is moving. Speed can be thought of as the rate at which an object covers a distance. While velocity is a vector quantity that refers to the rate at which an object changes its position. But when we calculate speed and velocity what we get is average not instantaneous. Average Speed= Distance travelled ------------------------ Time period Average Velocity= Displacement ------------------------ Time period

You think to velocity.Velocity is not equivalent to speed.