The problem describes a car traveling at a constant speed over equally-spaced lines on the road. Two photographs were taken, with the second photograph taken 0.5 seconds after the first. The distance between the lines is 1.7 m. We need to calculate the speed of the car in m/s, rounded to one decimal place.

1. Problem Description

The problem describes a car traveling at a constant speed over equally-spaced lines on the road. Two photographs were taken, with the second photograph taken 0.5 seconds after the first. The distance between the lines is 1.7 m. We need to calculate the speed of the car in m/s, rounded to one decimal place.

2. Solution Steps

First, we need to determine the number of lines the car has moved past between the two photos.

From the image, it appears that the car has moved past two lines in the 0.5 seconds.

Therefore, the distance covered is 2 times the distance between the lines.

Distance = Number of lines * Distance between lines

Distance = $2 \times 1.7$ m

Distance = $3.4$ m

Now we can calculate the speed using the formula:

Speed = Distance / Time

Speed = $3.4$ m / $0.5$ s

Speed = $6.8$ m/s

3. Final Answer

6. 8 m/s