Question

Pls answer the question with explanation

Answer 1

a) She started walking back

b) 0.13 km/min

Explanation:

The graph shows the distance traveled by Jo. She starts her journey (t=0) at a distance of 0 Km since the graph passes through the origin (0,0).

a) Ten minutes later she is at a distance of 1 km from the starting point and then the distance starts to drop. This means that at t=10 minutes, she started walking back.

b) To calculate the speed for the last 30 minutes of journey, we find the slope of the line. Select the points (30,0) and (60,4).

If a given line passes through points A(x1,y1) and B(x2,y2). The slope can be calculated with the equation:

`\displaystyle m=(y_2-y_1)/(x_2-x_1)`

Substituting:

`\displaystyle v=(4-0)/(60-30)=(4)/(30)`

v=0.13 km/min