If a truck driving at 18 km/hr slams on the brakes and stops in 20 meters. how fast did the truck decelerate

38 hope this helps

Explanation:

18 + 20 = 38

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 =