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lina2011 [118]
2 years ago
15

Pls answer the question with explanation

Mathematics
1 answer:
Vlad1618 [11]2 years ago
7 0

Answer:

<em>a) She started walking back</em>

<em>b) 0.13 km/min</em>

Step-by-step 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=\frac{y_2-y_1}{x_2-x_1}

Substituting:

\displaystyle v=\frac{4-0}{60-30}=\frac{4}{30}

v=0.13 km/min

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