Which are in static equilibrium?

Question

1. A box sliding down a ramp.
2. A baseball after being hit.
3. A box sliding along a horizontal surface.
4. A perfectly upright freely spinning top
5. A freely swinging simple pendulum
6. A spinning astronaut floating out in deep space.
7. A satellite orbiting Earth

I believe it is the 4, 6 and 7 options.

Answer 1

Some are arguable, but I agree with you.