What is the magnitude of the sum of these vectors?
a (1,1) v(0,0) u(1,-1) w(2,0)

answer; equivalent to a one(1) horsepower motor;

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 =