Question

In the System of particles Suppose we do not assume that the internal forces come in pairs. Then the fact that the
Sum of internal forces is zero follows from
1. conservation of angular momentum
2.conservation of energy
3. Newton's second law
4. principle of varitual displacement​

Answer 1

Answer:

An inertial frame of reference in classical physics and special relativity possesses the property that in this frame of reference a body with zero net force acting upon it does not accelerate; that is, such a body is at rest or moving at a constant velocity.[1] An inertial frame of reference can be defined in analytical terms as a frame of reference that describes time and space homogeneously, isotropically, and in a time-independent manner.[2] Conceptually, the physics of a system in an inertial frame have no causes external to the system.[3] An inertial frame of reference may also be called an inertial reference frame, inertial frame, Galilean reference frame, or inertial space.[4]