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A 1.5 kg object is thrown down with a speed of 10m/s from the top of...

A 1.5 kg object is thrown down with a speed of 10m/s from the top of a building that is some distance above a platform that is attached to an unstretched spring. The object hits the platform and compresses the spring by 2.6 m before coming to rest. The spring has a stiffness of 256 N/m. How high is the top of the building above the platform? Use engery techniques only.
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