Suppose a skydiver (mass = 75kg) is falling toward the earth. when the skydiver is 100m above the earth, he is moving at 60m/s. at this point, calculate the skydiver’s: • gravitational potential energy • kinetic energy • total mechanical energy (kinetic + potential)

gravitational potential energy is given as

here given that

m = 75 kg

g = 9.8

H = 100 m

now plug in all value above

now for kinetic energy we can use

here we have

m = 75 kg

v = 60 m/s

now we have

now for mechanical energy we have

so now we will add above to energy to find mechanical energy

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 =