Final answer:
The student's question concerns calculating time, speed, and distance within the topic of physics, focusing on kinematics. The formulas use values in SI units and involve understanding the concepts of average speed and average velocity as well as measuring uncertainties in practical scenarios.
Step-by-step explanation:
The questions you've asked are related to the basic principles of motion in physics, specifically, how to calculate speed, distance, and time when two of these quantities are known. The formulas involved are fundamental to understanding kinematics, which is a branch of classical mechanics that describes the motion of points, bodies, and systems of bodies.
Calculating Time
When you know the distance and speed and want to find the time, you can use the formula:
Time (t) = Distance (d) / Speed (v).
Calculating Speed
If you know the time and distance and want to calculate the speed, you use:
Speed (v) = Distance (d) / Time (t).
Calculating Distance
Knowing the speed and time allows you to find the distance using the formula:
Distance (d) = Speed (v) × Time (t).
For accurate calculations, these values should be in the same unit system, typically the SI units of meters for distance and seconds for time. The concept of average speed is also important; it's defined as the total distance traveled divided by the total time taken, regardless of any changes in speed during the journey. Moreover, it's essential to understand the difference between average speed and average velocity; average velocity involves displacement rather than total distance and requires direction.
Lastly, when it comes to measurements, it is crucial to consider any uncertainties in the values obtained and how these affect the calculated average speeds. Practically, measurements like distances and times are gathered using various devices; for time, it could be a stopwatch, and changes in its reading indicate a change in time.