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Question
Usain Bolt is fast. Really fast. He holds the World Record time for the 100m sprint at 9.58s. If he gets to average speed in just 2.21s, then what is his acceleration in mi/hr/s. Use the formula: Acceleration: (Delta)Velocity/Time

Answer
100 m  is about 328.08 ft, which is about 0.062137 miles.
9.58 seconds is about 0.0026611 hours.
Thus, his average speed (in miles/hr) is 0.062137/0.0026611 or about 23.35 miles/hr

Assuming a constant acceleration, then it is about 23.35/2.21 miles/hr/sec,
which is about 10.57 miles/hr/sec.

Abe M.  

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Abe Mantell

Expertise

Hello, I am a college professor of mathematics and regularly teach all levels from elementary mathematics through differential equations, and would be happy to assist anyone with such questions!

Experience

Over 15 years teaching at the college level.

Organizations
NCTM, NYSMATYC, AMATYC, MAA, NYSUT, AFT.

Education/Credentials
B.S. in Mathematics from Rensselaer Polytechnic Institute
M.S. (and A.B.D.) in Applied Mathematics from SUNY @ Stony Brook

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