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?
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javawarrior
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lol in first
Tomas.A
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wrong group
lgbasallote
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isnt it math?
joemath314159
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What is his/her initial medalage? does he/she start from 0?
Tomas.A
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physics
lgbasallote
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yup 0
lgbasallote
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but isnt this an ordinary math problem too?
lgbasallote
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i mean the basic concepts still come in play
javawarrior
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its both, physics and math.Arguably physics is nothing without math though :)
lgbasallote
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lol can we just teach me how to solve this? :p
javawarrior
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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
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but my book says 50 days o.O
joemath314159
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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
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yeah that'swhat i think too
joemath314159
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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
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so 4500 = 40t + t^2?
joemath314159
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yep
lgbasallote
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hmm yep i think that gives 50thanks