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# Massachusetts Comprehensive Assessment System

## 2016, Grade 8 Science and Technology/Engineering

Question 11: Open-Response
A student takes part in a 400 m race. The table below shows the distance the student traveled over time.
 Time (s) Distance (m) 0 0 30 100 60 200 90 300 120 400 150 400 180 400
1. On the grid in your Student Answer Booklet, copy the x-axis and y-axis labels as shown below and use the information from the table to make a proper scale by adding numbers to each axis on your graph.
1. Draw a line on your graph to represent the motion of the student from 0 s to 120 s.
2. Calculate the average speed of the student from 0 s to 120 s. Be sure to show your calculations and include units in your answer.
3. Is the student moving from 120 s to 180 s? Explain your answer.

### Scoring Guide and Sample Student WorkSelect a score point in the table below to view the sample student response.

ScoreDescription
4 The response demonstrates a thorough understanding of how to graph and interpret distance versus time graphs for constant speed. The response includes a correctly drawn graph and correctly calculates the average speed of the student. The response correctly identifies whether the student is moving during the time shown on the graph and clearly explains the answer.
4
3 The response demonstrates a general understanding of how to graph and interpret distance versus time graphs for constant speed.
2 The response demonstrates a limited understanding of how to graph and interpret distance versus time graphs for constant speed.
1 The response demonstrates a minimal understanding of how to graph and interpret distance versus time graphs for constant speed.
0 The response is incorrect or contains some correct work that is irrelevant to the skill or concept being measured.

Note: There are 2 sample student responses for Score Point 4.

Question 11:
Question 21: