Mathematics differntial equations (acceleration)

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SUMMARY

The discussion centers on solving a differential equation related to acceleration, specifically using the function a(t) = 3t² - 10t. The user initially calculated an incorrect answer of -3/2 instead of the correct answer of 2/3. The mistake occurred when the user attempted to separate variables in the equation v.dv = a(t).dx, failing to recognize that a(t) cannot be factored out due to the dependency of x on t. The correct approach involves understanding the relationship between v(t) and x(t) after finding v(t).

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Homework Statement



part b (question 1 ) , my ans is -3/2 ... but the ans given is 2/3... i don't know where's my mistake...
http://imgur.com/ZCrnKA8,bu5bblS
http://imgur.com/ZCrnKA8,bu5bblS#1 thanks in advance!


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The Attempt at a Solution

 
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you were given a(t)=3t2-10t
you put dv/dt = a(t) and solved the initial value problem to find v(t) and thus v(2).

in the next part you did fine up to: v.dv = a(t).dx but you cannot take a(t) outside the integration.
since x changes with t, t must be a function of x.

instead: since you have v(t) already:
consider: what is the relationship between v(t) and x(t)?
 
How did you get on?
 
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