Answer to Question #181917 in General Chemistry for hayley samantha farah

Question

Usain Bolt won multiple gold medals in the 2008, 2012, and 2016 Olympic games for the 100 m and 200 m dash events and team relay races.

In 2009, Bolt set the record for the fastest 200.0 m dash, with a time of 19.19 s. Calculate his average speed in both km/hr and mi./hr.

Solve: km/hr

     km/hr   

Solve: mi./hr

     mi/hr   

Answer 1

Average speed =Total distance/Total time

Lets put all the values in the simple formula

Total distance (in metres) = 200m

(in kilometre) =>200/1000 =>0.2km

(in miles) =>0.124miles (since 1metre=0.000621 miles)

Total time (in seconds) =>19.19 s

(in hrs) =19.19/3600 =>0.00533 hrs

(here division of time is done by 3600 because in 1 hour there are 3600 seconds and we have to convert the time in hrs)

Therofore, average speed (km/hr)

=>0.2/0.00533

=>37.52km/hr

Average speed (mi/hr) =0.124/0.00533

=>23.264 mi/hr