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A 30 kg object slides down a slope which is 60 m long and is at...

A 30 kg object slides down a slope which is 60 m long and is at an angle of 20 above the horizontal. The slope is smooth, there is no friction. The object starts with zero speed. At the bottom, it slides into a horizontal spring, which it compresses by 0.2 m before it stops. The spring is initially uncompressed.
Using potential energy, calculate the spring constant of the spring

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