Video Transcript
A bike moves uniformly. The position of the bike at two
different times is shown. What is the speed of the bike?
In this diagram, we see the bicycle
at zero seconds and two seconds. Over this time, it’s traveled a
distance of 10 meters. We want to solve for the speed of
the bike. We’ll call the speed 𝑣. In general, speed is given by this
equation. The speed of an object 𝑣 is equal
to distance it travels, 𝑑, divided by the time taken to travel that distance
𝑡. With our bicycle, we know the
distance it travels. That’s 10 meters, so 𝑑 is 10
meters. Then, what about the time 𝑡? We see the bike’s position at zero
seconds and two seconds. That means the total time is two
seconds.
Now that we know 𝑑 and 𝑡, we can
use our equation to solve for speed. 𝑣 is equal to 10 meters divided by
two seconds. In other words, it’s 10 divided by
two meters per second. 10 divided by two is five. So the speed of the bike is five
meters per second. The magnitude of this speed is
five, and the units are meters per second.
