Review answers

1. ⌃⌘5 (Control-Command-5).
2. On its edges — but only on its lower edges if handles are visible at the top edges.
3. ⌥-drag it.
4. Flow.
5. Timeline pins.
6. Blue.
7. Choose Custom speed, then uncheck the Ripple checkbox before changing the speed.
8. It plays every frame of the source clip at the timeline’s frame rate.
9. Optical Flow.
10. ⇧B (Shift-B).