part 1/3 Sand dunes in a desert move over time as sand is swept up the windward

Question

part 1/3

Sand dunes in a desert move over time as sand is swept up the windward side to settle in the lee side. Such “walking” dunes have been known to walk 20.5 ft in a year and can travel as much as 107.2 ft in particularly windy times.
Calculate the average “walking” speed in normal times.
Answer in units of m/s

part 2/3

Calculate the average “walking” speed in windy times.
Answer in units of m/s

part 3/3

Fingernails grow at the rate of drifting conti- nents, about 9.5 mm per year.
Approximately how long did it take for North America to separate from Europe, a distance of about 3021.1 mi? 1 mile is 1609 m.
Answer in units of y

Explanation / Answer

it's all relative

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