How much does the spring stretch. a 1200 rm kg car, Ask an Expert

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Q. A mass of 3.0 kg rests on a smooth surface inclined 28 degrees above the horizontal. It is kept from sliding down the plane by a spring attached to a wall. The spring is aligned with the plane and has a spring constant of 120 N/m. How much does the spring stretch?

Q. A 1200 {rm kg} car traveling at a speed of 15 {rm m/s} skids to a halt on wet concrete where f_k = 0.20. how long are the skid marks?

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