4x100 m team of Williams , Frater , Blake and Bolt post World Record time of 36.85 secs . Usain Bolt wins three gold medals for the second successive Olympic Games . And Bolt was celebrating with them , doing the 'Mo-Bot ' -- copying the celebration of British athlete Mo Farah , who completed a Olympic double earlier in the day winning the men 's 5,000m as well as the 10,000m earlier in the week -- as he followed his 100m and 200m golds with a relay victory . The USA second at 38 secs after Bolt pulls away in the final leg of the race . Canada are disqualified after the race and the bronze medal is given to Trinidad & Tobago .
4x100 m team of Williams , Frater , Blake and Bolt post World Record time of 36.85 secs . Usain Bolt wins three gold medals for the second successive Olympic Games . The USA second at 38 secs after Bolt pulls away in the final leg of the race . Canada are disqualified after the race and the bronze medal is given to Trinidad & Tobago .