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# Help with M1 question watch

1. Why a runner's acceleration cannot exceed 10μms^-2?. where μ is the coefficient of friction between her shoes and the track. The highest speed that a runner can keep during 800 m race is 8 ms^-1. Show that the fastest time she can hope to achieve by standing start is (100+ 2/5μ )
2. Zacken, TeeEm Student403, help this person pls xD i can't. Also to OP i'm sure this isn't M1
3. Could you please show a picture of the question? It's a little unclear from your original post
4. (Original post by thefatone)
Zacken, TeeEm Student403, help this person pls xD i can't. Also to OP i'm sure this isn't M1
Sorry I am teaching all day
5. Sorry. I can't help with the first part of the question but I will post a pic of the solution to the second part once I've downloaded the TSR app
6. (Original post by spico)
Sorry. I can't help with the first part of the question but I will post a pic of the solution to the second part once I've downloaded the TSR app
Please do not post full solutions to help questions
7. I get the 100 part because 8m/s goes into 800 by 100s

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8. Posted from TSR Mobile
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9. That first Part of working is the time taken to accelerate to the maximum speed of 8ms^-1. The other part right by it is the amount of distance covered whilst accelerating. beneath that I have shown the time taken to cover the rest of the 800m (800 - previous answer.) The final part combines the two times and cancels it down.
11. (Original post by Student403)
Please do not post full solutions to help questions
12. (Original post by thefatone)
Basically my reaction
13. lol
14. Sorry, I missed the response asking me not to. Should I remove the post?
15. (Original post by spico)
Sorry, I missed the response asking me not to. Should I remove the post?
I think it's fine for now, seeing as OP isn't getting any help otherwise. But in future please don't post full solutions as we prefer to help the OP get there him/herself

Thanks!

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Updated: February 28, 2016
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