# Velocity expression

1. Sep 25, 2005

### ytsejam

hi this is first time for me here and it seems very useful.

my question is:

the expression is velocity of object while t->infinity

the object will stop somewhere in time? and if it will , when

i think it will go on forever. but i'm not sure

thanks

liron

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2. Sep 25, 2005

### LeonhardEuler

A good way to look at it is to remember that $$e^{-x}=\frac{1}{e^x}$$, so
$$V(t)=\frac{v_0}{e^{t/x}}$$
Now it should be clear what happens as time approaches infinity. Keep in mind, though that approaching a number is something different from reaching it.

3. Sep 25, 2005

### ytsejam

correction

correction...my fault in the paste.
the x supposed to be taw-time constant.

thanks

4. Sep 25, 2005

### LeonhardEuler

That really doesn't change anything, now it is just:
$$V(t)=\frac{v_0}{e^{t/\tau}}$$

5. Sep 25, 2005

### ytsejam

so it will stop?

6. Sep 25, 2005

### LeonhardEuler

As time approaches infinity the speed will get closer and closer to zero, but not reach it. It will move so slowly that it will not travel an infinite distance, it will just get closer and closer to some point, going more and more slowly and never getting there.

7. Sep 25, 2005

### ytsejam

...what i thought.

thanks for clearing it for me