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= the (square of the velocity (m/s) * drag coefficient ) newtons

if terminal velocity is known (forces balanced , no further acceleration), drag coefficient can be found.

say terminal velocity(tv) = 70 m/s, acceleration due to gravity(g) = 9.8 m/s^2,

mass(m) = 80kg

m * g (force down) = tv^2 * drag coefficient (force up) at terminal velocity

then

m * g / tv^2 = drag coefficient

80 * 9.8/4 900 = 0.16

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