- #1

- 18

- 0

Show mathematically that an object can have a negative position but a positive velocity.

I had this idea that it can go to like the left at 45 m/s or something...but im not sure :P help!

- Thread starter star223
- Start date

- #1

- 18

- 0

Show mathematically that an object can have a negative position but a positive velocity.

I had this idea that it can go to like the left at 45 m/s or something...but im not sure :P help!

- #2

- 18

- 0

omg theres like 3 more too...IM SOOOO CONFUSED!

- #3

Gokul43201

Staff Emeritus

Science Advisor

Gold Member

- 7,051

- 18

In the future, post this in the Homework Help section.

(would someone move this ?)

- #4

- 18

- 0

oh like to the right it just has to start froma negative position rite?

- #5

tony873004

Science Advisor

Gold Member

- 1,751

- 143

There's no reason that position or original position can't be negative. They're not under a squre root symbol. Given enough time, position will cross 0 and become positive. And position is just a relative thing anyway. A car travelling east and is 1 mile west of mile marker 2 could be said to have a position of -1 mile relative to mile marker 2, or +1 mile relative to mile marker 0.

But I don't know how to express that mathematically.

- #6

- 18

- 0

im not sure if it means an equation or a graph or what...omg im gona get an F :(

- #7

Gokul43201

Staff Emeritus

Science Advisor

Gold Member

- 7,051

- 18

That's right.star223 said:oh like to the right it just has to start froma negative position rite?

Consider x(t=0s) = -10m (this is a negative position)

and x(t=1s) = -5m (also negative)

The v = (x1-x0)/t = ?

- #8

- 18

- 0

Okay wait.. v=(x1-xo)/t =?

v=(-10+5)/1s ????

v=-5m/s? is that rite?

v=(-10+5)/1s ????

v=-5m/s? is that rite?

- #9

- 18

- 0

A stunt car is driven along a flat train car. The stunt car is moving toward the engine of the trani. how would you calculate the velocity of the stunt car relative to Earth?

I put. . .'You would find the velocity of the ____ then the velocity of the stunt car. Then subtract using V2-V1...' Do i find the velocity of the train? And if it is the train, then is that V2?

- #10

tony873004

Science Advisor

Gold Member

- 1,751

- 143

Some trains have more than one engine. Assuming that it meant that the car is moving towards the front of the train, you would add the train's velocity to the car's velocity.star223 said:

A stunt car is driven along a flat train car. The stunt car is moving toward the engine of the trani. how would you calculate the velocity of the stunt car relative to Earth?

I put. . .'You would find the velocity of the ____ then the velocity of the stunt car. Then subtract using V2-V1...' Do i find the velocity of the train? And if it is the train, then is that V2?

- Replies
- 14

- Views
- 1K

- Replies
- 11

- Views
- 2K

- Replies
- 10

- Views
- 1K

- Replies
- 1

- Views
- 2K

- Last Post

- Replies
- 4

- Views
- 1K

- Replies
- 7

- Views
- 574

- Replies
- 5

- Views
- 4K

- Replies
- 2

- Views
- 2K

- Replies
- 3

- Views
- 962

- Last Post

- Replies
- 5

- Views
- 5K