An object's momentum increases from $160\,\text{kg m s}^{-1}$ to $240\,\text{kg m s}^{-1}$ over $2\,\text{s}$. What is the mean resultant force acting on the object during this interval?
- A$40\,\text{N}$
- B$80\,\text{N}$
- C$200\,\text{N}$
- D$400\,\text{N}$