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What does mathematically a second squared means?

Let us consider we have a Car that is traveling through space from point A to point B.

At point A it has 0 velocity; and at point B it reaches a velocity of 1m/s.

The acceleration therefore is 1m/s squared.

For example:

Let us have 2 points in space: A and B, and they are 1 meter away from each other.

A---------B ; if I square this distance in space I get the following:

D---------C

! !

! !

A---------B

With this operation I have added a new dimension to space, and it is easy to understand.

Now let us have 2 points in the time domain: A and B, and they are 1 second away from each other.

A---------B ; if I square this distance in time I get the following:

D---------C

! !

! !

A---------B

Now I get in trouble; if I think of time as flowing from A to B, what does time squared actually mean?

Notice that I understand the concept of Acceleration as the rate of change of velocity:

Acceleration = Velocity (meters per second) per Time (second); but mathematically I don't get to understand Time (s) squared;

I appreciate your answers.

Thank you,