A lead sphere is dropped from rest at point X, far above the surface of a planet. The sphere moves in a vacuum. After $4.0\ \text{s}$, it has travelled a vertical distance of $3.0\ \text{m}$. Assume that the acceleration of free fall remains constant. What distance from point X will the sphere have travelled after $20\ \text{s}$ from release?
- A15 m
- B75 m
- C80 m
- D2000 m