4.0 kg |2068
The system shown above is released from rest. If friction is negligiths, the acceleration of the 4.0 kg block sliding on the table shown above is most nearly
0
B) 1.7 m/s2
С
3.3 m/s2
D) 5.0 m/s2
E
10.0 m/s2

unbalanced force

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 =