How does the final kinetic energy of the system in an inelastic collision compare to the initial kinetic energy?

The final kinetic energy is less than the initial kinetic energy.

Kinetic energy is the form of energy that one possesses when he is in motion.

During an inelastic collision, the momentum of the system is conserved, but the total kinetic energy is not conserved.

Some part of the initial kinetic energy of the system gets lost in the form of heat, light, and sound produced during the collision. Consequently, the final kinetic energy must be less than the initial kinetic energy.

Thus, the final kinetic energy is less than the initial kinetic energy.

Learn more about kinetic energy, here:

link

 In an inelastic collision, the total kinetic energy after the collision is not equal to the total kinetic energy before the collision. While inelastic collisions may not conserve total kinetic energy, they do conserve total momentum.

Explanation:

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =