If we place another identical ball onto the table, the situation changes .Now there is one ball with energy, and one that is not moving ( its peed is 0m/s Calculate the total thermal energy of the system by adding the energy of each ball

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 =