lgbasallote
  • lgbasallote
An OpenStudy user's speed is 40 medals per day and his acceleration is 2 medal/day^2. If it takes 4,500 medals to reach the Legend rank, how many days will it take for him to reach the rank?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
lol in first
anonymous
  • anonymous
wrong group
lgbasallote
  • lgbasallote
isnt it math?

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anonymous
  • anonymous
What is his/her initial medalage? does he/she start from 0?
anonymous
  • anonymous
physics
lgbasallote
  • lgbasallote
yup 0
lgbasallote
  • lgbasallote
but isnt this an ordinary math problem too?
lgbasallote
  • lgbasallote
i mean the basic concepts still come in play
anonymous
  • anonymous
its both, physics and math.Arguably physics is nothing without math though :)
lgbasallote
  • lgbasallote
lol can we just teach me how to solve this? :p
anonymous
  • anonymous
well first of all, his acceleration cant be 2 medals/day a = v / t since you postulated that v = 40 per day a = 40 per day because a = delta V / delta t
lgbasallote
  • lgbasallote
but my book says 50 days o.O
anonymous
  • anonymous
I would consider it an initial velocity. Its like saying a car is going at 40 ft/s, and accelerating at 2 ft/s^2.
lgbasallote
  • lgbasallote
yeah that'swhat i think too
anonymous
  • anonymous
To solve the problem use the formula:\[d = x_0+v_0t+\frac{1}{2}at^2\]Set d to 4500, intial position to 0, intiial velocity to 40, and acceleration to 2. Solve for t.
lgbasallote
  • lgbasallote
so 4500 = 40t + t^2?
anonymous
  • anonymous
yep
lgbasallote
  • lgbasallote
hmm yep i think that gives 50thanks

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