Which of the following choices is not a system equation of the following suspension system? Assume u is the displacement input, y is the displacement output; y>x>u; 𝑥′,𝑥″are the 1st order and 2nd order derivative of x, respectively.Group of answer choices𝐹𝑘1=𝑘1(𝑥−𝑢)All of the rest choices are correct system equations for the system𝐹𝑏=𝑏(𝑦′−𝑥′)𝐹𝑘2=𝑘2(𝑦−𝑥)𝐹𝑛𝑒𝑡1=𝑚1𝑥″

The question is asking which of the given equations is not a system equation for the given suspension system. The equations represent forces in the system, where F represents force, k and b are constants, m is mass, and u, x, and y are displacements. The primes denote derivatives with respect to time.

1. 𝐹𝑘1=𝑘1(𝑥−𝑢): This equation represents the force exerted by the first spring, which is proportional to the difference in displacement between x and u.

2. 𝐹𝑏=𝑏(𝑦′−𝑥′): This equation represents the damping force, which is proportional to the difference in velocity (first derivative of displacement) between y and x.

3. 𝐹𝑘2=𝑘2(𝑦−𝑥): This equation represents the force exerted by the second spring, which is proportional to the difference in displacement between y and x.

4. 𝐹𝑛𝑒𝑡1=𝑚1𝑥″: This equation represents the net force acting on the first mass, which is equal to the mass times the acceleration (second derivative of displacement).

Without additional context or information about the system, it's not possible to definitively say which of these equations is incorrect. However, if we assume that all forces and displacements are defined and calculated in a consistent manner, then all of these equations could be valid for a certain suspension system. Therefore, the answer would be "All of the rest choices are correct system equations for the system".