Question

As of early 2018, Usain Bolt holds the world record in the men's 100-meter dash. It is 9.58 seconds. What was his average speed in km/h? Assign the result to a variable called hundred.
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Answer 1

Answer:

36 km/h(approx)

Explanation:

s=100 m

t=9.58s = 10s(approx.)

s=v * t

v=s/t=100/10=10 m/s(approx.)

10 m/s= 10*18/5 km/h =36 km/h(approx.)

Answer 2

Average speed of Usain Bolt during men's 100 meter dash is 10.43 m/sec.

Explanation:

The given data is as follows.

          Distance = 100 meter,   time = 9.58 seconds

          average speed = ?

Therefore, formula to calculate average speed or a person or object is as follows.

                Speed = $\frac{\text{Distance}}{\text{Time}}$  

So, putting the given values into the above formula and calculate its average speed as follows.

             Speed = $\frac{\text{Distance}}{\text{Time}}$  

                         = $\frac{100 m}{9.58 sec}$  

                         = 10.43 m/sec

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