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A rough calculation or an approximation of the value, number, quantity, or extent of something so that it is usable for some purpose even if the input data may be incomplete or uncertain.

8 votes

How is it possible that the energy needed to stop a train is the same as the (chemical) ener...

I believe he is wrong, but not about the number. From @JohnRennie answer we see the energy of the cookies is roughly equal to the train's kinetic energy, so we need such amount of energy to accelerat …
jingyu9575's user avatar