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# Word Problems/Science/Math

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

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,

Abe M.
Questioner's Rating
 Rating(1-10) Knowledgeability = 10 Clarity of Response = 10 Politeness = 10 Comment Thank you so much. I couldn't understand how to do it but your answer helped alot. Thank you

Word Problems

Volunteer

#### 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