The graph illustrates the motion of a car over a 5-second period. Which row gives a time when the car is stationary and a time when it is travelling at a constant speed?
- Athe car is at rest at $0.0\,\text{s}$ and is moving at a constant speed at $2.0\,\text{s}$
- Bthe car is at rest at $0.0\,\text{s}$ and is moving at a constant speed at $4.0\,\text{s}$
- Cthe car is at rest at $4.0\,\text{s}$ and is moving at a constant speed at $0.0\,\text{s}$
- Dthe car is at rest at $4.0\,\text{s}$ and is moving at a constant speed at $2.0\,\text{s}$