No, all bodies do not have the same inertia. Inertia is directly proportional to mass, and different bodies have different masses. According to Newton’s first law of motion, an object’s inertia is its resistance to changes in motion. Objects with greater mass exhibit higher inertia, resisting changes in their state of motion more strongly. Conversely, objects with lesser mass have lower inertia and respond more readily to external forces. Therefore, the inertia of a body depends on its mass, and different bodies with different masses will have different levels of inertia.