Posted by **Dan** on Tuesday, October 28, 2008 at 9:42pm.

When you cough, your windpipe contacts. The speed v, with which air comes depends on the radius,r, of your windpipe. If R is the rest radius of your windpipe, then for r </= R the speed is given by:

v=2(R-r)r^2

i got the derivative:

v'=4rR-6r

what do i do next??

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