>>21
飛距離は
L(θ) = x(t1)
 = u(0)(m/k)[1 - exp(-T)]
 = u(0)(m/k) T/(1+K)
 = u(0)(m/k) 2K{1 - (4/3)K + (14/9)KK - (232/135)K^3 + ・・・・}

 K = k・w(0)/mg,
 u(0) = v0・cosθ,
 w(0) = v0・sinθ,