# Homework Help: Question Regarding Time Passage @ Light Speed

1. Oct 22, 2008

### Austellio

1. The problem statement, all variables and given/known data
"Anthony and Dobson are twins. Dobson travels in a straight line away from Earth for 7 years according to his time at 0.96 times the speed of light. After 7 years he turns back and travels back to Earth at half the speed. Meanwhile, Anthony was waiting stationary on Earth. When Dobson gets back, what is the age difference in years between Anthony and Dobson ?"

2. Relevant equations

3. The attempt at a solution
None =\ very much confused on this extra credit question.

A couple bucks via PayPal if anyone can help me figure this out. I don't want just an answer, but help understanding the math behind the answer.

2. Oct 22, 2008

### borgwal

Ever heard of time dilation?

3. Oct 22, 2008

### Austellio

I am familiar with the concept but as far as the math behind it, i'm completely clueless. Been reading everything I could get my hands on, it's making me feel real stupid >.<

4. Oct 22, 2008