Question Video: Calculating the Relative Speed of Two Object Moving in the Same Direction | Nagwa Question Video: Calculating the Relative Speed of Two Object Moving in the Same Direction | Nagwa

# Question Video: Calculating the Relative Speed of Two Object Moving in the Same Direction Science • Third Year of Preparatory School

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A blue object and an orange object move across a grid of lines spaced 1 meter apart. Each object moves for 2 seconds. The arrows show the distances that the objects move in each second. What is the speed of either object relative to the other?

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### Video Transcript

A blue object and an orange object move across a grid of lines spaced one meter apart. Each object moves for two seconds. The arrows show the distances that the objects move in each second. What is the speed of either object relative to the other?

In this question, we’re asked to find the speed of either of the objects shown relative to each other. From the question, we know that each object moves for two seconds and each grid line is spaced one meter apart. Now, looking at the arrows in the diagram, we can see that both objects are traveling in the same direction and each object travels two meters during the two seconds.

First, we can determine the speed of each object. Recall that speed is equal to the distance traveled divided by the time traveled for. In this question, each object travels two meters in two seconds. So each object has the speed of one meter per second.

Let’s take a closer look at the changes in the distance between these objects. Each time that the blue object travels one meter away from the orange object, the orange object also travels one meter and in the same direction as the blue object. Therefore, we can see that the distance between the objects is not changing as the objects move. We can then define an equation for relative speed, recalling that relative speed is equal to the change in distance divided by the time.

Because there is no change in distance between the objects, our numerator is zero, which means that the relative speed between the objects is zero meters per second.

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