If you were to drop a watermelon at velocity speed of 75 mph from 26400ft in the air how long until it would hit the ground

Not 100% sure but if I'm right its 15 min.

Explanation: 1 mile is equal to 5380 feet, 26400 ÷ 5380 = 5, 75 ÷ 5 = 15

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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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 =