Cart a, with a mass of 0.2 kg, travels on a horizontal air track at 3 m/s and hits cart b, which has a mass of 0.4 kg and is initially at rest. after the collision the center of mass of the two cart system has a speed in m/s of: 0 m/s 1.0 m/s 2.3 m/s 2.5 m/s 5.0 m/s

b mirrors submit a iisner? e. for which optical devices does d sometimes have a positive value? o a a and b o b. a and c o c. b and d 0 d. b and cb

answer and 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 =