Question

erin used a motion detector to collect data while she walked. based on the graph, all of these statements are true of erins walk except -

Explanation:

Step1: Analyze each option

• Option 1:
• Check if Erin walked toward the motion detector during only one interval.
• In the graph, when the distance from the motion detector is decreasing, Erin is walking toward the detector.
• There is only one such interval (segment \(B\)).
• Option 2:
• Check if Erin got as close as 1 foot away from the motion detector.
• The minimum value of the distance - axis ( \(y\) - axis) in the graph is \(1\) foot.
• Option 3:
• Check if Erin ended her walk 7 feet away from the motion detector.
• Look at the end - point of the graph. The \(y\) - value (distance from the detector) at the end of the walk is \(7\) feet.
• Option 4:
• Check if Erin stood still for 3 seconds.
• When Erin stands still, the distance from the motion detector does not change with time (a horizontal line on the distance - time graph).
• There is no horizontal line segment of length \(3\) seconds on the graph.

Answer:

Erin stood still for 3 seconds.