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A fighter jet landing on an aircraft is made to brake very quickly by means of cable that the plane connects to via a hook.   Assume that a 21,000 lb jet touches down at 170 mph and its speed is reduced to zero in 240 ft  Assuming constant deceleration, calculate the force applied to the jet by the braking cable.  In order to get a feel for the magnitude of he force, calculate the braking force acting on a 3500 lb car in order to bring it (at constant deceleration) from 60 mph to zero in 140 ft.  How many of these "car force units needed to obtain the force actin on the jet? 

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