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gaobo9109
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Homework Statement
A particle of mass m falls from rest; the resistance of the air when the speed is v is kv2 where k is a constant. Show that after a time t, the velocity v and the time t are related by the equation t = V/2g ln[(V + v )/(V - v)] where V2
= mg/k
Homework Equations
The Attempt at a Solution
ma = mg - kv2
a = g - k/m v2
dv/dt = g - k/m v2
dv = g - k/m v2dt
v = gt - k/m v2t
t = v/(g - k/m v2)
But I don't know how to continue from here.
I have been studying differential equation on my own, so I am not very strong in the foundation