Answer:
d. velocity
Step-by-step explanation:
First of all, we must identify the difference between speed and velocity:
- Speed is a scalar quantity, defined as the ratio between the distance covered by an object and the time taken. Being a scalar, it does not have a direction.
- Velocity is a vector quantity, defined as the ratio between the displacement of the object (change in position) and the time taken. Being a vector, velocity has both a magnitude and a direction.
Now let's go back to the problem. You are walking at 2 m/s: it means that this value does not change, so your speed is constant.
However, you are walking in a circle. This means that the direction of your motion is constantly changing: therefore, your velocity is changing. So the correct answer is
d. velocity