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rossie
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V_t = SQRT(W/CA) W= 70KG X 9.81M/S^2 = 687 N (neglecting W of parachute) V_t = 14/ms ; C = 0.88kg/m^3 A= W/(C x V_t^2) = 687N/(0.88kg/m^3 x 196m^2/s^2)= 3.98 m^2 A= pi x R^2 R= SQRT(A/PI) = 1.3
