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force down f=ma

air restance force is dependant on velocity and aerodynamics

say 100kg falling , terminal velocity = 70m/s

f=ma = 100 *10 = 1000n

at terminal velocity forces equal

air resistance 1000n = v^2* resistance figure for this body (r)

r = 1000/v^2

r = 1000/4900

r = 0.204 this figure can be used to calculate air resistance at different speeds

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