Question: A car moves along a straight road. It moves at a speed of 50 km/h for 4 minutes, then during 4 minutes it gradually speeds up to 100 km/h, continues at this speed for 4 minutes, then during 4 minutes gradually slows to a stop. Make a sketch like the figures in Section 1.2, marking dots for the position along the road every minute.

The acceleration is described as the rate at which an object's velocity changes with respect to time. The term "acceleration" refers to a vector quantity.

The acceleration and deacceleration are the polar opposites of each other. It refers to how quickly the body slows down.

During the first four minutes, the car moves with constant speed. During next four minutes, it accelerates so that its speed gets doubled.

During next four minutes, the car again moves with constant speed. During last four minutes, the car decelerates gradually and comes to rest.

Based on the above observations, the required sketch is:

When the crosses are close to each other, they represent that more distance has been travelled in the particular time interval. When they are far away, they represent less distance has been travelled.

Thus, the required sketch has been drawn.