Posted by Amber on Tuesday, April 24, 2012 at 12:05am.
height y = 12 - 16t^2
shadow at x, similar triangles, so
x/12 = (x-4)/y
or,
xy = 12x - 48
y dx/dt + x dy/dt = 12 dx/dt
y=8 when t=1/2
x=6 when y=8
(12 - 16t^2) dx/dt + x (-32t) = 12 dx/dt
at t=1/2,
8 dx/dt - 96 = 12 dx/dt
dx/dt = 96/-4 = -24 ft/s
Oops.
x=12 when y=8
make the change and percolate it through the rest of the solution.
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