A 1.8 kg mass oscillates on a spring hanging from the ceiling. If the speed of the mass is 1.4 m/s as it moves through its equilibrium position, what is the potential energy of the system when totally compressed?

e) none of the above answers are correct

it's a b and

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 =