As the car’s speed rises, the drag force also rises. When the speed is $20\,\text{m s}^{-1}$, the total drag force is $400\,\text{N}$. The car has a mass of $1200\,\text{kg}$ and a constant driving force of $700\,\text{N}$. Which of the following statements about the car’s acceleration at $20\,\text{m s}^{-1}$ is correct?
- AThe acceleration is $0.25\,\text{m s}^{-2}$ but will decrease as time passes.
- BThe acceleration is $0.25\,\text{m s}^{-2}$ but will increase as time passes.
- CThe acceleration is $0.58\,\text{m s}^{-2}$ but will decrease as time passes.
- DThe acceleration is $0.58\,\text{m s}^{-2}$ but will increase as time passes.