Which of the following graphs shown below represents the uniform motion of an object?

In the velocity-time graph shown below, the ratio of the distance travelled by the object in the last 2 s and the distance travelled in 7 s is :

1. $\dfrac{1}{2}$

2. $\dfrac{1}{4}$

3. $\dfrac{1}{3}$

4. $\dfrac{2}{3}$

The velocity-time graph given below shows:

1. Uniform acceleration
2. Average speed
3. Uniform velocity
4. All of these

The velocity-time graph given below shows an object moving in a straight line. The displacement and the distance travelled by the object in 6 s will respectively be :

1. 8 m, 16 m
2. 16 m, 8 m
3. 16 m, 16 m
4. 8 m, 8 m