38. A 2,000-kg ore car rolls from rest 50.0 m down a frictionless 10.0° incline. If there is a spring at the end of the incline, what spring constant is required to stop the ore car in a distance of 2.00 m? a. 1700 kN/m b. 85.1 kN/m c. 68.1 kN/m d. 340 kN/m c. 170 kN/m

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