A cyclist moving along a straight path at $8.0\,\text{m s}^{-1}$ increases speed to $12\,\text{m s}^{-1}$ over a period of $6.0\,\text{s}$. Which expression gives the cyclist’s acceleration?
- A$\frac{6}{12-8}$
- B$\frac{8}{12-6}$
- C$\frac{12-6}{8}$
- D$\frac{12-8}{6}$