( ignore air resistance and gravity ) During a flood a tree truck of mass 100 kg falls down a waterfall. The waterfall is 5 m
high. Calculate..
a) the potential energy of the tree trunk at the top of the waterfall.
b) the kinetic energy of the tree trunk at the bottom of the waterfall.
c) the velocity of the tree trunk at the bottom of the waterfall.

its a 5.5 n

glad that

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 =