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The sports car is easier to push because it has less mass and therefore less inertia.
What is mass and inertia?
Inertial mass is the property of an object that determines how its motion changes when a force acts on it.
Inertia is the resistance of any physical object to a change in its velocity. This includes changes to the object's speed, or direction of motion. An aspect of this property is the tendency of objects to keep moving in a straight line at a constant speed when no forces act upon them.
The tendency of an object to resist changes in its state of motion varies with mass. Mass is that quantity that is solely dependent upon the inertia of an object. The more inertia that an object has, the more mass that it has. The amount of inertia an object has is determined by its mass. The mass of a substance or object is based on the number and density of atoms in it.
Learn more about mass and inertia, refer:
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