A parachutist whose mass is 70 kg drops from a helicopter hovering 4000 mn above the ground and falls under the influence of gravity. Assume that the force in newtons due to air resistance is bi = 30 N-sec/m when the chute is closed and b2 = 100 N-sec/m when the chute is open. If the chute does not open until 1 min after he leaves the helicopter, after how many seconds will he hit the ground? Use g = 10 m/sec². %3D

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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1. A parachutist whose mass is 70 kg drops from a helicopter hovering 4000 m above the ground and
falls under the influence of gravity. Assume that the force in newtons due to air resistance is bị = 30
N-sec/m when the chute is closed and b = 100 N-sec/m when the chute is open. If the chute does not
open until 1 min after he leaves the helicopter, after how many seconds will he hit the ground? Use
9 = 10 m/sec².
Transcribed Image Text:1. A parachutist whose mass is 70 kg drops from a helicopter hovering 4000 m above the ground and falls under the influence of gravity. Assume that the force in newtons due to air resistance is bị = 30 N-sec/m when the chute is closed and b = 100 N-sec/m when the chute is open. If the chute does not open until 1 min after he leaves the helicopter, after how many seconds will he hit the ground? Use 9 = 10 m/sec².
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