A body with mass $4.0\,\text{kg}$ and speed $3.0\,\text{m s}^{-1}$ collides with a stationary object in an inelastic collision. Which statement is correct?
- AAfter collision, the total kinetic energy is $18\,\text{J}$.
- BAfter collision, the total kinetic energy is less than $18\,\text{J}$.
- CBefore collision, the total kinetic energy is $12\,\text{J}$.
- DBefore collision, the total kinetic energy is less than $12\,\text{J}$.