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An 900-kg roller-coaster car is launched...

An `900-kg` roller-coaster car is launched from a giant spring of constant `k = 31 kN//m` into a frictionless loop-the-loop track of radius 6.2 m as shown in Figure. What is the minimum amount that the spring must be compressed if the car is to stay on the track ?

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`3 m`
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