Objects P and Q make up an isolated system. Object P has mass $6.0\,\text{kg}$ and is travelling at a speed of $3.0\,\text{m s}^{-1}$. Object Q has mass $2.0\,\text{kg}$ and is travelling at a speed of $4.2\,\text{m s}^{-1}$ at an angle of $35^{\circ}$ to the path of P. Objects P and Q collide and remain stuck together. What is the magnitude of the component of the final momentum of the combined objects in the original direction of P?
- A$9.6\,\text{kg m s}^{-1}$
- B$11\,\text{kg m s}^{-1}$
- C$13\,\text{kg m s}^{-1}$
- D$25\,\text{kg m s}^{-1}$