Final answer:
To order the objects from greatest to least speed, consider the typical speeds of a rocket, bicycle, and snail. The correct order is Rocket, Bicycle, Snail, corresponding to option A as rockets are the fastest and snails are the slowest of the three.
Step-by-step explanation:
The question pertains to the concept of speed, which is a scalar quantity in physics representing the rate at which an object covers distance. When ordering the different objects by their speed, we look at the typical speeds of the objects mentioned: a rocket, a bicycle, and a snail. A rocket is designed to travel at extremely high speeds to enter space, a bicycle can travel quickly but not nearly as fast as a rocket, and a snail is known for moving very slowly.
Therefore, the correct order from greatest to least speed would be: Rocket, Bicycle, Snail. This answer matches option A: Rocket, Bicycle, Snail. Each object mentioned is understood to be moving at a constant speed, so their typical speeds can be compared without consideration for acceleration or deceleration.