Question Video: Determining the Speed of Two Objects Relative to a Set of Grid Lines | Nagwa Question Video: Determining the Speed of Two Objects Relative to a Set of Grid Lines | Nagwa

# Question Video: Determining the Speed of Two Objects Relative to a Set of Grid Lines 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 grid lines that it crosses?

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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 grid lines that it crosses?

Here, we are asked to find the speed of either object when measuring the position of that object relative to the grid lines that it is crossing. We are told that the grid lines are each one meter apart. And we can see that each object passes a total of two grid lines. Each object must then travel a distance of two meters. We are also told that each object moves for two seconds.

All the grid lines are stationary. This means that the motion of an object toward or away from a grid line is the only thing that affects the speed of an object relative to the grid line. We see then that the equation for the speeds of the objects will just depend on the changes in distance of the objects.

Remember that the speed of an object is the distance traveled by an object divided by the time that the object travels for. In our question here, both objects travel two meters in two seconds. Therefore, the equation for speed for each of the objects will be that their speed is equal to two meters divided by two seconds. When we simplify this, we get the speed of the objects is one meter per second. This is the speed of either object relative to the grid lines that it crosses.

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