Potential Energy Spring Compression | How far is the spring compressed?

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Q. Place a 3 kg block at the top of a 3.4 m high frictionless incline. At the bottom of the incline, the block encounters a spring with a constant of 400 N/m on a horizontal surface.

(a) If no energy is lost to friction, how far is the spring compressed?

(b) If the horizontal surface has a coefficient of friction of 0.20, how far does the block slide while compressing the spring?
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