The graph illustrates how the speed $v$ of a sprinter varies with time $t$ in a $100\,\text{m}$ race. What is the best estimate of the sprinter’s greatest acceleration?
- A$0.5\,\text{m s}^{-2}$
- B$1\,\text{m s}^{-2}$
- C$3\,\text{m s}^{-2}$
- D$10\,\text{m s}^{-2}$