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14 August, 12:12

If you walk at 2 m/s in a perfect circle, what is changing?

choices: a. speed

b. mass

c. volume

d. velocity

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Answers (1)
  1. 14 August, 15:07
    0
    d. velocity

    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
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