Help? BR page 33

[sharpieLIFE]

Hey Everyone,
I'm a bit confused about the third paragraph on page 33 involving height and time.
Example 1.14 on page 31 is very similar and I have no idea where they are getting that from.
Any help would be appreciated !

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[santeprof]

I am willing to try the problems. Ill need the problems, answers and explanations.