Speed versus time
the graph below suggests
a. a constant speed of 3 m/s followed by speed of 1 m/s
b. a constant velocity of 2 m/s followed by speed of zero
c. a constant speed of 4 m/s followed by speed of zero
d. a constant acceleration of 2 m/s followed by speed of zero
f. a constant speed of 2 m/s followed by speed of zero

this is poiselle's equation from fluid mechanic in physics. mech eng

because if the tool that you are using is not balanced it there would be false mass.

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 =