Let me summarize the conflict in this example:
The acceleration to be applied corresponds to 2x10^12 meter/(second squared)
(in words: two times ten to twelve) which means in vacuum that water molecule
may gain two times ten to twelve meter/second velocity at every second (e.g.
for dilute case). And in the end, the velocities are: 2.6745 km/s or 0.2220
km/s. (in words: minus two point six seven four five kilometer/second and zero
point two two two zero kilometer/second, respectively). Can you imagine a water
molecule which goes with a velocity of two kilometer per second?
Easily :)
Are you familiar with molecular-kinetic theory ? Molecular speeds in
range 0.5 - 1.5 km/s are very common.
Look here:
http://www.chem.ufl.edu/~itl/2045/lectures/lec_d.html
or
http://hyperphysics.phy-astr.gsu.edu/Hbase/kinetic/kintem.html#c4
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