# Time Dilation , 100m dash

1. Aug 30, 2009

### jinksys

1. The problem statement, all variables and given/known data
An athlete has learned enough physics to know that if he measures from the earth a time interval on a moving spacecraft, what he finds will be grater than what somebody on the spacecraft would measure. He therefore proposes to set a world record for the 100m dash by having his time taken by an observer on a moving spacecraft. Is this a good idea?

2. Relevant equations

3. The attempt at a solution

An athlete has learned enough physics to know that if he measures from the earth a time interval on a moving spacecraft, what he finds will be grater than what somebody on the spacecraft would measure.

WUT?

2. Aug 30, 2009

### kuruman

To do this problem, first you need to have some understanding about time dilation and length contraction. It would be a good idea to get background information up on these subjects. That's wut.

3. Aug 30, 2009

### jinksys

Is the observer on the ship taking the time measurement using a clock on the ship or a clock on the ground?

4. Aug 30, 2009

### kuruman

The observer on the ship measures time with a clock that is at rest with him/her.