# The actual meaning of delta in these circumstances

1. Dec 7, 2007

### Spookie71

1. The problem statement, all variables and given/known data
Please don't make fun of my question, I just want to have a strong understanding of the meaning and it's use

My textbook just pops these symbols out at me without explanation. Maybe it just expects I know this stuff
Code (Text):

In the equation Vs = $$\Delta$$ d / $$\Delta$$ t

2. Dec 7, 2007

### Shooting Star

Delta denotes the difference in the value of a quantity. Suppose you are moving along a st line and you are at a dist d1 from a fixed point O (on the st line) at time t1. Afterward, at time t2, you are at a dist d2 from the same point O. Then we say delta d = d2-d1 and delta t = t2-t1.

Notice that the average speed in moving from first pt to the second is (d2-d1)/(t2-t1) = delta d/ delta t.

3. Dec 7, 2007

### Spookie71

Thank you shootingstar