Observe the figure and answer the question. What is the law to which this property is related ?

Hint: In order to answer this question we should first get some idea about the inertia. The resistance of any physical object to any change in velocity is known as inertia. Changes in the object's speed or direction of motion are included. The tendency of objects to continue travelling in a straight line at a steady speed when no forces occur on them is one example of this feature.

Complete answer:
Depending on the context, the term "inertia" can refer to an object's "amount of resistance to change in velocity" or, in simpler terms, "resistance to a change in motion" (which is defined by its mass), or it can also refer to its momentum. The term "inertia" is better understood as a shorthand for Newton's "principle of inertia," which states that an item that is not subject to any net external force moves at a constant velocity. As a result, an object will continue to move at its current velocity unless a force causes it to change speed or direction.

So when we observe the figure properly we get to know Newton's first law of motion is related to a body's inertia property.

Note: Let us understand some more points which are related to inertia. The concept of inertia is a fundamental concept in classical physics that is still used to describe how objects move and are affected by applied forces.