I have moved the following from an answer of mine to here.
I believe it is in accord with the accepted answer and could be
- left here.
- converted to a comment to the accepted answer.
- edited into the accepted answer (I lack the rep to do this).
- deleted.
I'l leave it to more experienced hands to decide it's fate :-)
A note on units:
I have updated this answer toWe should use the units more familiar to an international audience. Wikipedia claimsWikipedia claims "SI is the world's most widely used system of measurement" So I have expressed speeds in SI
However, units. Units in quotations I havefrom other sources should be left alone to preserve their integrity but I have. Conversions to metric units can be provided a calculated SI value outside the quotation. See The International System of Units (SI).