Question

A parachutist whose mass is 75kg drops from a helicopter hovering 4000m above the ground and falls toward the earth under the influence of gravity

A parachutist whose mass is 75kg drops from a helicopter hovering 4000m above the ground and falls toward the earth under the influence of gravity. Assume the gravitational force is constant. Assume also that the force due to the air resistance is proportional to the velocity of the parachutist with the proportionality constant b1=15N sec/m when the chute is closed and b2=105N sec/m when the chute is open. If the chute does not open till 1 minute after the parachutist leaves the helicopter after how many seconds will he hit the ground?
any help would work i suppose

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