A cyclist is moving at 72 km/h. What is their speed in m/s?

To convert the cyclist's speed from kilometers per hour (km/h) to meters per second (m/s), you can use the conversion factor that 1 km/h is equal to approximately 0.2778 m/s.

First, start with the cyclist's speed:

72 km/h.

Now, apply the conversion:

72 km/h * 0.2778 m/s per km/h = 20 m/s.

This indicates that the cyclist's speed in meters per second is 20 m/s.

The correct answer corresponds to the conversion calculation, showing that the choice indicating 20 m/s accurately represents the translation of the speed from kilometers per hour into meters per second. Understanding this conversion method is crucial for solving similar problems in mechanics where speed units may vary.