Question

Frankie fredericks,a Namibia's Olympic athlete,covered a distance of 100 m in 9.90s
Calculate the following:
*the distance in metres (m) he would have covered in a minute,if he maintain a constant speed throughout the race.
*The distance in kilometres (km) he would have covered in an hour (h) running at the same Speed,covering the same distance.
*His average speed in the 100 m in kilometres per hour (km/h).

Answer 1

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Answer 2

Answer:

Step-by-step explanation:

Distance covered = 100 m

Time taken to cover the 100 m distance=9.90 second

1.

The distance covered by him in 1 minute or 60 second:

Distance covered by him in 1 second is=$\frac{100}{9.9}$

Therefore, distance covered by him in 1 minute or 60 second is=$\frac{100}{9.9}\times60=606.06\text{ m}$

2.

The distance covered by him in 1 hr or 3600 second:

Distance covered by him in 1 second is=$\frac{100}{9.9}$

Therefore, distance covered by him in 1 hr or 3600 second is=$\frac{100}{9.9}\times3600=3636.36\text{ m}=3.636\text{ km}$

3.

Average speed:

Distance covered $D=100\text{ m}=\frac{100}{1000}\text{ km}=0.1\text{ km}$

Time taken to cover the 100 m distance$T=9.90\text{ s}=\frac{9.9}{3600}\text{ hr}$

$\text{Average speed}=\frac{\text{Distance covered}}{\text{Time}}$

Therefore,

$S=\frac{D}{T}\\\\\Rightarrow S=\frac{.1}{\frac{9.9}{3600}}\\\\\Rightarrow S=\frac{.1\times3600}{9.9}\\\\\Rightarrow S=\frac{3600}{99}\\\\\Rightarrow S=36.36\text{ km/hr}$