Um caminhão viaja pela estrada com velocidade de 70km/h. diante de um obstáculo ele é freado e para cerca de 360 segundos depois. qual foi a aceleração media?

Explanation:

The question in english is written below:

A truck travels along the road at a speed of 70 km/h. It encounters an obstacle and brakes for about 360 seconds until it stops. What is the average acceleration of the truck?

Average acceleration is the variation of velocity over a specified period of time :

Where:

is the initial velocity

the final velocity

Then:

Finally:

Note the negative sign in the acceleration indicates the truck was decreasing its velocity until it stopped.

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 =

the ima (higher than 1m) will be greater than the ima with the height of 1m.