Video Transcript
The grid shown consists of equally
spaced lines. A blue object and an orange object
are both moving across the grid with uniform speeds. The objects move for the same
duration. How do the speeds of the objects as
they travel compare? (A) The blue object has greater
speed. (B) The orange object has greater
speed. Or (C) the speeds of the objects
are the same.
Let’s start by recalling that the
speed of an object measures the distance the object moves in some amount of
time. Here, we were told that both
objects move for the same duration, so they move for the same amount of time. We can compare their speeds, then,
by comparing the distance that each object travels. For instance, if one object moves
farther than the other in the same amount of time, then we know that it must have a
greater speed.
Let’s use the marks on the grid to
measure how far each object moves. For the orange object, we can see
that it moves one, two, three, four, five units. And for the blue object, it moves
one, two, three, four, five units, the same as the orange object. This means that both objects move
the same distance over the same amount of time, so we can conclude that their speeds
are the same.
Option (C) is the correct
answer. We’ve found that the speeds of the
objects are the same.
