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6. Son Ye Jin (SYJ), 45 kg, drops from a helicopter 4 km above the ground. Assume the air resistance
is proportional to the velocity of the SYJ, with k
15 N-sec/m when the chute is closed and with
constant k₂ = 105 N-sec/m when the chute is open. If the chute does not open until 1 min after SYJ
paraglides, when will she hit the ground?

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