saifoo.khan
  • saifoo.khan
Anyone online?
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
saifoo.khan
  • saifoo.khan
Q4
1 Attachment
shadowfiend
  • shadowfiend
Let me sketch out a FBD for you really quick.
shadowfiend
  • shadowfiend
Derp heh. A diagram, not a free body diagram. No forces here :p

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More answers

saifoo.khan
  • saifoo.khan
It is dealing with v = u + at first, then s = ut + 0.5at^2
shadowfiend
  • shadowfiend
|dw:1327119231882:dw| First move is finding when A is at its apex.
saifoo.khan
  • saifoo.khan
i got 0.5 secs
shadowfiend
  • shadowfiend
You can find that by solving \(v = v_0 + at\) for t, and plugging in \(v_0 = 5\) and \(v = 0\) (since velocity is 0 at the apex), and \(-9.8ms^{-2}\) for a, since we are accelerating against gravity.
shadowfiend
  • shadowfiend
If you got 0.5s, I assume you're using \(-10ms^{-2}) as an approximate for gravity?
saifoo.khan
  • saifoo.khan
Check this out..
1 Attachment
shadowfiend
  • shadowfiend
I get 2.775 (= 2.8) for the s of B...
shadowfiend
  • shadowfiend
You seem to be using 7 for its velocity, it has a v_0 of 8.
saifoo.khan
  • saifoo.khan
OMG! im blind.
shadowfiend
  • shadowfiend
:) It happens. The other s is right, so I'm guessing everything else will work out :)
saifoo.khan
  • saifoo.khan
i get correct answer now, w.r.t marking scheme! :D 1.5N.
shadowfiend
  • shadowfiend
!! Awesome :)
saifoo.khan
  • saifoo.khan
Yes!
shadowfiend
  • shadowfiend
Just watch out for those numbers :) They're sneaky little things.
saifoo.khan
  • saifoo.khan
Thanks!!! ^_^
shadowfiend
  • shadowfiend
No problem!
saifoo.khan
  • saifoo.khan
what about the (ii) part?
shadowfiend
  • shadowfiend
Whoops, let me have a look-see.
mathmate
  • mathmate
Is it part ii you want to see?
saifoo.khan
  • saifoo.khan
Yes.
shadowfiend
  • shadowfiend
I'll let mathmate help heh. I got distracted trying to track down a song that's been stuck in my head all day >_<
mathmate
  • mathmate
I have 8t-(g/2)t^2-(5t-(g/2)t^2) = 0.9 which solves for 3t=0.9, or t=0.3 (the g... terms cancel out). Then height of A is 5(0.3)-(g/2)(0.3)^2 =1.0586 (using g=9.81)
saifoo.khan
  • saifoo.khan
OMG! that's correct. :D
saifoo.khan
  • saifoo.khan
http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9709%20-%20Mathematics/9709_w02_ms_4.pdf Page 4.
saifoo.khan
  • saifoo.khan
i was confused about which one to make variable to.. hehe it was "t"/
mathmate
  • mathmate
Great, I guess I got too many digits, but it's easier to cut than to add! :)
saifoo.khan
  • saifoo.khan
right.
saifoo.khan
  • saifoo.khan
thanks!
mathmate
  • mathmate
Good night then... till next time!
mathmate
  • mathmate
You're welcome! :)
saifoo.khan
  • saifoo.khan
:]

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