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並前往https://holooly.com/solutions/the-spring-has-a-stiffness-k-50-lb-ft-and-an-unstretched-length-of-2-ft-as-shown-it-is-confined-by-the-plate-and-wall-using-cables-so-that-its-length-is-1-5-ft-a-4-lb-block-is-given-a-speed-v-_/

The spring has a stiffness k = 50 lb/ft and an unstretched ...

As shown, it is confined by the plate and wall using cables so that its length is 1.5 ft. A 4-lb block is given a speed ...

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