Which of the following is not a Newton's law of motion?

• A.The time rate of change of linear momentum is directly proportional to the external force applied and it takes place in the direction of the force.
• B.In the absence of external forces, an object at rest remains at rest and an object in motion continues in motion with a constant velocity.
• C.If two objects interact, the force, F12, exerted by object 1 on object 2 is equal in magnitude and opposite in direction to the force, F21, exerted by object 2 on object 1.
• D.The force required to stretch or compress a spring is directly proportional to the extension or compression, provided that the elastic limit is not exceed.