Question

calculate the average speed of "ussain bolt" who sprints 100min 9.81sec during 2016 Rio olympics to win gold medal?????

Answer 1

let assume that distance is 100m
average speed = d/t
=100/609.81m/s
=36000/60981km/hr
so, his speed will be approx 0.6 km/hr

Answer 2

Given:
Total distance travelled= 100m
Total time taken =9.81 sec
Average speed =?
Average Speed=Total Distance / Total Time
Average speed =100/9.81
                         =10.19m/s
∴ The average speed of "ussain bolt" who sprints 100m in 9.81sec during 2016 Rio olympics to win gold medal is 10.19m/s