The diagram illustrates the trajectory of a stone that is projected from X and attains its greatest height at Y. As it travels from X to Y, the stone increases by $10\,\text{J}$ in gravitational potential energy. At Y, the stone has $2.0\,\text{J}$ of kinetic energy. The effects of air resistance may be ignored. What kinetic energy did the stone have just after it was thrown at X?
- A$2.0\,\text{J}$
- B$8.0\,\text{J}$
- C$10\,\text{J}$
- D$12\,\text{J}$