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A mass of 3.0 kg rests on a smooth surface inclined 28 above the horizontal.

A mass of 3.0 kg rests on a smooth surface inclined 28 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?  
   360 cm  
   12 cm  
   24 cm  
   36 cm  

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