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In a railroad classification yard, a 71-Mg freight car moving at 1.4 m/s at A encounters a retarder section of track at B which exerts a
retarding force of 24 kN on the car in the direction opposite to motion. Over what distance x should the retarder be activated in order
to limit the speed of the car to 3.2 m/s at C?
142 m
x
A
2.0 m
B
(Vertical scale exaggerated)
Answer: x= i
m

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