Question

1. how many times does the person come to a stop?
2. which segments do not show the person stationary (stopped)? (a segment is one point to the another point: d to e)
3. how far did the object travel from segment c to d?

cars a, b, c, and d are all traveling at a constant speed, which car is traveling at the fastest speed?
which car is the slowest?

1. which car is traveling the fastest? how do you know?
2. which car is traveling the slowest? how do you know?

Explanation:

Question 1

Step1: Identify stationary segments

A person is stationary when distance doesn't change over time (horizontal segment). Segments B - C and D - E are horizontal.

Step2: Count stationary segments

There are 2 horizontal segments, so the person stops 2 times.

Step1: Recall stationary definition

Stationary is when distance vs time is horizontal. Non - stationary is when distance changes (non - horizontal).

Step2: Identify non - stationary segments

Segments A - B (distance increases), C - D (distance increases), E - F (distance decreases) are non - horizontal.

Step1: Find distance at C and D

From the graph, distance at C is 2 km, distance at D is 11 km.

Step2: Calculate distance traveled

Distance traveled from C to D is $11 - 2=9$ km.

Answer:

2 times

Question 2