Question

A runner of mass 94 kg complete a hundred m race in 9.6 sec.Calculate its K.E.​

Answer 1

Answer:

You wrote: an athelete can run 100m in 10s

That is - the athelete is able to run 100m in 10s

The next statement is “therefore the athelete ran 10m in 1s”

This second statement is saying that the athelete went on a particular run (when?) and, because of his ability you are assuming special knowledge of the particular run that the athelete went on.

But you have not provided how you know the run was at least 10m long, or that the athelete ran, this time, at the previous ability level. The athelete may have been faster this time, or just jogged along.

Just because someone is able to do something, does not mean that they did it.

but you may have misstyped.

Maybe you mean the athelete went on a 100m run, and completed the run in 10s.

That would mean their average speed was 10m/s … but it does not mean that their speed was 10m/s throughout the entire run. Since they had to accelerate and decelerate at each end of the run, and probably varied speed a bit during, the top speed was probably higher… and we do not know the minimum speed, because we don’t know how the 100m run was timed ;)

So the first 10m probably was not covered in 1s… the athelete was accelerating.

Your question would then be to see if it is possible for the athelete’s speed-time graph to be so that there is no 10m length of track the run that was covered in 1s.

ie. You want to know if there is a v(t) with the property that: ∀t∈[0,9]∫t+1tv(t′)dt′≠10 … something like that.

But the bottom line is that there is not enough information to make the determination.

Step-by-step explanation:

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