15 miles per second is 54,000 miles per hour.
At that speed you could orbit the Earth twice, in less than one hour.
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1 km per second is defined as equal to 1000 meters per second. Therefore, a speed of 15 meters per second is 15/1000 km per second or 0.015 km per second.
15 cents per second is 15 x 60 cents per minute. That's 15 x 60 X 60 cents per hour. Dividing by 100, That's 15 x 6 x 6 dollars per hour, or 540 dollars per hour.
5 metres per second squared
This is if you can run around 15 to 16 feet per second or 10 to 11 miles per hour. If you train 10mph is not that hard to achieve. So yes it is fairly easy for a fit person.
40 miles per hour. There are four 15 minute intervals in an hour. What do yo have to do to get miles traveled in 15 mts. Try it. Good luck!