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They're all around you. ' e ' is involved in the formula for the speed of anything, whenever

the speed depends on how much farther it still has to go.


-- current flowing out of a battery, as the battery discharges

-- current flowing into a battery from the charger, as the battery fills up

-- rate at which heat flows out of a cup of hot coffee as it cools to room-temperature

-- your speed, if you're walking to school and you cover 1/2 of the remaining distance every minute.

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Q: What are the applications of the maths symbol e in real life?
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