A body with mass $2.0\,\text{kg}$ moves along a horizontal frictionless surface at $3.0\,\text{m s}^{-1}$. It collides head-on with another body of mass $1.0\,\text{kg}$ that is at rest. After the collision, the two bodies remain stuck together. How much kinetic energy is lost on impact?
- Azero
- B$2.0\,\text{J}$
- C$2.4\,\text{J}$
- D$3.0\,\text{J}$