Description
A parachutist whose mass is 60𝑘𝑔 drops from a helicopter hovering 1000𝑚 above the ground and falls toward the
ground under the influence of gravity. Assume that the force due to air resistance is proportional to the velocity of
the parachutist, with the proportionality constant 𝑏1=30𝑁-𝑠𝑒𝑐𝑚 when the chute is closed and 𝑏2=100𝑁-sec/m
when the chute is open. If the chute does not open until the velocity of the parachutist reaches 15𝑚𝑠𝑒𝑐, after how
many seconds will the parachutist reach the ground? Assume that the acceleration due to gravity is 9.81𝑚𝑠𝑒𝑐2.
The parachutist will reach the ground after
seconds.
(Round to two decimal places as needed.)
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