Question

calculate the average speed of usainbolt who sprints 100 m in 9.81sec during 2016 rio Olympics to win gold medal

Answer 1

average speed=total distance÷total time
=100/9.81
=10.19 m/s
average speed of ussain bolt is 10.19 m/s

Answer 2

The average speed of Ussain Bolt in Rio Olympics 2016 for 100 meter race (one quantity) which he cleared in 9.81 seconds can be calculated by
Average Speed= total distance/time taken
Average Speed= 100/9.81= 10.19 m/s
Which is his average speed for one second e.g. how many meters he will run in one second.