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3. An object of mass 3.5 kg is released from rest
600 m above the ground and allowed to fall under
the influence of gravity. Assume the gravitational
force is constant, with g = 9.81 m/sec2, and the
force due to air resistance is proportional to the
velocity of the object with proportionality constant
b = 3 N-sec/m. Determine when the object will
strike the ground.

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