Consider the following situations:

1. A car is moving along a straight road at a constant speed.
2. A car is moving along a straight road while slowing down.
3. A car is moving along a straight road while speeding up.
4. A hockey puck slides along a horizontal icy (frictionless) surface.
5. A hockey puck slides along a rough concrete surface.
6. A cockroach is speeding up from rest.
7. A rock is thrown horizontally; air resistance is negligible.
8. A rock is thrown horizontally; air resistance is substantial.
9. A rock is dropped vertically; air resistance is negligible.
10. A rock is dropped vertically; air resistance is substantial.

Which of these situations describe the motion shown in the motion diagram at point B

Which of these situations describe the motion shown in the motion diagram at point C

Type the letters corresponding to all the right answers in alphabetical order. Do not use commas. For instance, if you think that only situations C and D are correct, type CD.