Trolley X, with mass $2.0\,\text{kg}$, is travelling rightwards at $2.0\,\text{m s}^{-1}$. Trolley Y, with mass $1.0\,\text{kg}$, is travelling leftwards at $1.0\,\text{m s}^{-1}$. The trolleys collide and then remain stuck together. The collision lasts for a total of $0.20\,\text{s}$. What is the average force acting on trolley X during the collision?
- A$3.3\,\text{N}$
- B$10\,\text{N}$
- C$15\,\text{N}$
- D$25\,\text{N}$