A 25.5 kg child swings on a swing set. At the top of the swing's arc, the child reaches a height of 1.50 m from the ground. What are the child's PE and KE respectively at the bottom of the arc? 188 J and 188 J
0 J and 375 J
375 J and 0 J

neither accurate nor precise.

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 right answer is 0.3 meters per second