Author note — to cover

Cover average speed as total distance over total time across multi-stage journeys including stops, why averaging two speeds fails even over equal distances, and finding a missing stage from a stated overall average. Distance-time graph versions are speed-from-a-distance-time-graph; velocity, acceleration and kinematics formulas are A level mechanics. Both tiers. (R11)

• Fluency — direct questions on average speed, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).