Question

Look at the graph below measuring the speed of the truck and answer the following two questions please.

1) If the graph represents speed, what is measured on the X and Y axes?(please specifically identify which axis is which)

2)Based on what the Y axis measures, explain the motion of the truck represented by the graph from point 2 to 6?

Answer 1

Question 1:

The Distance-Time graph of an object gives the speed of the object, as speed is defined as ratio of total distance travelled to total time taken. So, if the given graph is the graph of speed, the axes represent time and distance.
The time is always represented along x-axis in such case and distance is represented along y-axis. The time varies from 0 to 6 and Distance varies from 0 to 25. 

Question 2:

From point 2 to point 6 on x-axis, there is no change in the distance covered as the value on y-axis is not changing. This means the truck is not moving and is stationary from point 2 to point 6. 

A horizontal line in the distance - time graph always represents that the object is stationary. 

It can also be seen in this way, the distance covered at point 6 is the same as the distance covered at point 2. This shows the truck did not cover any distance between point 2 and 6. 

Answer 2

Answer:

13) a) x axis = Time , y axis = Distance

b) The truck is moving at a constant speed.

Explanation:

a) The time is always kept on the x-axis as it is an independent variable.

b) The truck is covering same distance after every equal interval of time. That's why the truck is at a constant speed and the graph is showing no upward or downward moment but fixed at 20 units of y-axis from units 2-6 of x-axis.