Under many conditions, the center of mass of a system of particles can represent the system as a whole. But how far does this rule extend?

Consider two identical particles traveling toward each other at the same speed. By examining this system, choose the correct response.

a. The momentum and kinetic energy of the center of mass is equivalent to that of the system of particles.
b. The kinetic energy, but not the momentum, of the center of mass is equivalent to that of the system of particles.
c. Neither the momentum nor the kinetic energy of the center of mass is equivalent to that of the system of particles.
d. The momentum, but not the kinetic energy, of the center of mass is equivalent to that of the system of particles.

The correct answer is a

Explanation:

The concept of center of mass strongly simplifies the analysis of problems, since all the external bridging forces = denote the point of the center ce plus.

                 xcm = 1 / M ∑xi mi

                 v cm = 1 / M ∑ xi vi

When we do this, the momentum and the kinetic energy are conserved, that is, it is equivalent to the movement of the particle system

The correct answer is a

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

the five characteristics of adolescence are biological growth and development, and undefined status, increased decision making, increased pressure and the search of self.