Posted by hilary on Wednesday, January 6, 2010 at 5:54pm.
You need to estimate the wind drag force based upon his projected area. That area is 1.65 x 0.40 = 0.66 m^2
The drag force is approximately
(1/2)*(body area)*(air density)*(headwind speed)^2
The air density is about 1.2 kg/m^3
His weight will not matter except for a basic metabolism energy burning rate, which they did not ask for.
Multiply the drag force (in Newtons) by the distance traveled (1000 m) for the energy (work) required, in Joules.
There is no exact answer to this one. Drag coefficients depend upon shape; I used a value of 1.
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