The idea
The persistent confusion is between a quantity and its rate of change. A large velocity does not mean a large acceleration, and zero velocity does not mean zero acceleration — the top of a thrown ball is the counterexample worth having ready.
Lesson
No lesson built yet. The worked solutions below are the material it would be assembled from.
Questions (5)
| Question | Type | Difficulty | Drift | Accuracy |
|---|---|---|---|---|
| A car travels 150 m in 10 s at constant speed. What is its speed in m/s? | numeric | Easy -1.30 | — | — (0) |
| A car accelerates uniformly from rest to 20 m/s in 5 s. What is its acceleration in m/s²? | numeric | Moderate -0.40 | — | — (0) |
| A ball is thrown straight up. At the highest point of its flight, what are its velocity and acceleration? | mcq | Moderate 0.30 | — | — (0) |
| A stone is dropped from rest off a cliff and hits the ground after 3.0 s. How tall is the cliff, in metres? Ta… | numeric | Hard 0.90 | — | — (0) |
| A car's velocity–time graph is a straight line sloping downward, crossing zero and continuing below the axis. … | short | Hard 1.30 | — | — (0) |