## nma 3 years ago on a velocity-time graph who can you tell a person goes backwards

1. theEric

If you consider forward as the positive direction, as many people probably would... then what sign would the backwards direction be?

2. theEric

If this just confused you, I'm sorry! I want to make a small point, though, that signs often matter in physics.

3. nma

negative

4. theEric

Right! So if the velocity is backwards, it is considered negative. So if you see that the velocity is negative, the velocity is backwards :)

5. theEric

Oh, I guess I should also say... If the velocity is backwards, then you'll see that the velocity is negative!

6. theEric

|dw:1350527399138:dw|

7. theEric

if the velocity line or curve is below velocity = 0, which will be below the time axis because the time axis is at velocity = 0, then the velocity is backwards.

8. theEric

|dw:1350528332182:dw|

9. theEric

From t=0, meaning "the start", this guy was heading backwards. At various speeds! But backwards the whole time. At the end, there, he or she was heading backwards pretty fast (compared to how fast she or he was going earlier).