<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Inertia is the resistance of any physical object to any change in its state of motion . This includes changes to the object's speed, direction, or state of rest . </P> <P> Inertia is also defined as the tendency of objects to keep moving in a straight line at a constant velocity . The principle of inertia is one of the fundamental principles in classical physics that are still used to describe the motion of objects and how they are affected by the applied forces on them . </P>

What is the numerical value for the speed of an object at rest