To determine the distance of Sarah from the detector after 35 seconds, we need more information about the motion or the speed at which Sarah is moving. For example, if Sarah is moving at a constant speed, we would need to know that speed to calculate the distance.
The formula to calculate distance is:
\[ \text{Distance} = \text{Speed} \times \text{Time} \]
If you provide her speed or clarify how her distance from the detector is changing over time, I can help you calculate her distance after 35 seconds.