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The free-fall velocity of a parachutist can be simulated as

du/dt=g-Cd/m u^2

where u = velocity (m/s) t= time (s)

g = acceleration due to gravity (9.81 m/s2).

Cd = drag coefficient (kg/m),

and m = mass (kg).

For a 80-kg parachutist, solve this equation numerically from t = 0 to 30 s given that u(0) = 0. During free fall, Cd = 0.25 kg/m. However, at t = 10 s the chute opens, whereupon Cd = 5 kg/m.

Please help! from were I should start solving this problem!