A stone is released from rest from a point $2.0\,\text{m}$ above the surface of a planet. There is no atmosphere around the planet. Immediately before it reaches the planet’s surface, the stone’s speed is $3.8\,\text{m s}^{-1}$. What is the acceleration of free fall on the planet?
- Azero
- B$1.9\,\text{m s}^{-2}$
- C$3.6\,\text{m s}^{-2}$
- D$7.2\,\text{m s}^{-2}$