Final answer:
The 10 kg tricycle at rest has the greatest inertia because inertia depends solely on mass, and the tricycle has the highest mass among the given options.
Step-by-step explanation:
The question asks which object has the greatest inertia. Inertia is a property of an object that describes its resistance to changes in its state of motion and is directly related to the object's mass. The greater the mass, the greater the inertia. In this case, the object with the greatest inertia is the one with the greatest mass. Velocity does not affect inertia; only mass matters. Given the four options, a 10 kg tricycle at rest has the greatest inertia because it has the highest mass among the listed objects, regardless of their states of motion.