- #1
Falken_47
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Homework Statement
Hi, I've got an assignment which involves finding the function of velocity against time, given the information that the particle is moving with intial velocity of v0 and that it experience a resistive force of -βv2
Homework Equations
From the problem I've derived model of: ma = -βv2
The Attempt at a Solution
re-arranging the model, I have equation of:
dv/dt = -β/m * v2
then, using techniques from seperable equation,
dv/v2 = -β/m * dt
-1/v = -β/m * t + C1
pluging in v(0) = v0
-1/v0 = -β/m * 0 + C1
Or
C1 = -1/v0
Now, plugging in C and rearraging the equation, I obtained
-1/v = -β/m * t - 1/v0
v = m/(β * t) + v0
So as you can see, I'm able to derived the velocity function, but the problem lies to the fact that if I try to plug in t=0 for the velocity, then the function will not work as division by zero is not allowed
Therefore, I'm thinking that something is wrong with my velocity function but up till now I can't still figure it out
Thank you in advance!