What is the efficiency of a ramp if you do 400 J of work to push a 60 N box up the ramp until it is 3.0 m above the ground?

we need to know the time interval during which the force acts. impulse of force = momentum change

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 =