Random uncertainty from repeats
Repeated timing measurements in a rail braking data set are \(1.4\,\text{s}\), \(1.41\,\text{s}\), and \(1.46\,\text{s}\). Estimate the random uncertainty using half the range. Use the diagram before entering the requested value. Enter the numerical result and choose the interpretation that matches the physics meaning.
Worked practice: physics data and result
Read the physical quantities first, then calculate the result and state what it means.
Write a full answer
Now write the response in full, in your own words — this is what the exam asks for. The AI marks it on the same moves you built above (focus, evidence, technique, judgement) and gives feedback on reasoning, evidence, and expression.