You are analyzing a video of a moving object and want to calculate its average velocity. The video has a frame rate of 15 fps. As you are analyzing the video frame by frame, you see that the object moves a distance of 45 cm in 8 frames. What is the average velocity of the object in m/s?

v= 0.8 m/s

Explanation:

We can apply the definition of average velocity, as follows:

       

        where Δx = d = 0.45 m

In order to get the time t, we need to convert the frame rate to time.If the frame rate is 15 fps, this means that one frame lasts for 1/15 sec, as follows:

           

total time is just time for one frame, times 8 frames:

       t = 0.07 sec/fr*8 fr = 0.56 sec. (2)

Replacing d and t in (1), we get:v = 0.8 m/s    

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