The graph indicates how a car’s speed changes over part of its journey. What is the value of the car’s acceleration between $6\,\text{ s}$ and $10\,\text{ s}$?
- A$0.50\,\text{m s}^{-2}$
- B$0.80\,\text{m s}^{-2}$
- C$1.25\,\text{m s}^{-2}$
- D$1.50\,\text{m s}^{-2}$