### Subject: how do u represent a reverse in velocity in the space time diagram?

Date: Mon Dec 23 11:20:39 2002
Posted by Hoda
City: London State/Province: n/a Country: UK
Area of science: Physics
ID: 1040660439.Ph
Message:
```
Hi there , here is my question

At t=t'=0 a traveller sets out from earth with velocity u=+0.5c. The traveller
is identified with the frame reference O'. He travels for 5 years (according
to his clock), and then suddenly reverses direction, returning to earth with
the same speed.
Plot the world of the traveller in a space -time diagram and Show that for O'
his line of simultaneity when his clock reads t'=5 years just after turning
around satisfies:
t=7.22-0.5x

I am not sure how to show a change in speed in the space time diagram. When
the traveller is moving away from the earth , the ct'-axis and the x'-axis are
both in the first quadrant. (the world line of a photon bisecting the both
sets of axes) And the ct'-axis is the traveller's world line , ( I think) .
Now, what happens when the he reverses his direction , does the ct'-axis and
the x'-axis both reflect about the ct axis?

For the second part I used the Lorenz transformation , and I ended up with :
t=7.44 - 0.5x .

Any help will be highly appreciated.

```

Re: how do u represent a reverse in velocity in the space time diagram?

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