David Sang and Darrell Hamilton Solutions for Chapter: Describing Motion, Exercise 7: Exercise 2.6

Diagrams A - D in figure show speed - time graphs for four moving objects. Complete the table by indicating in the second column the graph or graphs that represent the motion described in the first column.

The graph represents the motion of a car that accelerates from rest and then travels at a steady speed.

Determine the acceleration of the car in the first part or its journey from the graph.

Sketch a speed - time graph for the car whose journey is described here. 
The car set off at a slow, steady speed for $20 \mathrm{s}$.
Then, during a time of $10 \mathrm{s}$, it accelerated to a faster speed. 
It travelled at this steady speed for $20 \mathrm{s}$. 
Then it rapidly decelerated and came to a halt after $10 \mathrm{s}$.