Question

what is inertia?......​

Answer 1

Answer:

Inertia is the resistance of any physical object to any 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.

Inertia comes from the Latin word, iners, meaning idle, sluggish. Inertia is one of the primary manifestations of mass, which is a quantitative property of physical systems.

Answer 2

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Inertia is the inability of body to change its state of motion, from rest to motion, motion to rest or change its speed until external force is applied.

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...Hope it helps....