A projectile of mass $0.40\,\text{kg}$ is launched into the air and travels along a curved trajectory above level ground. It remains in motion for $1.5\,\text{s}$ before reaching the ground again. The landing point is $18\,\text{m}$ horizontally from where it started. Air resistance can be ignored. Calculate the kinetic energy of the object when it is at its highest point.
- A$0\,\text{J}$
- B$2.4\,\text{J}$
- C$11\,\text{J}$
- D$29\,\text{J}$