MICHAEL PHELPS
CHAD LE CLOS
On Tuesday, 31 July 2012, Chad le Clos, the South African swimmer, won the
200 m butterfly in 1 min 52.96 secs to beat the world record holder
Michael Phelps by 0.05 seconds in this
event at the Olympic Games held in London.
( (a) Calculate the average speeds in m/sec of Phelps and le Clos during the 200 m butterfly race
on 31 July 2012
(ANS : le Clos : 1.770538244 m/sec and Phelps : 1.769754889 m/sec)
( (b) By how many millimetres did le Clos beat Phelps at the finish of the 200 m butterfly event
on 31 July 2012? (88.4877 mm).
CALCULATION:
After 1 min 52.96 secs Phelps swam 200 × 112.96/113.01 = 199 991.5123 mm
Which is 88.4877 mm short of le Clos’s 200 000 mm.
© DESMOND DESAI, DMD EDU-HOME, 1 August 2012
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