Q11. A 3.6-kg collar travels down a smooth slope as shown. The spring has unstretched length of 8 m and spring constant k= 25 N/m, and it is always horizontal. Determine the work done by the weight to the collar during the process when the it moves from s1 = 16 m to s2 = 8 m. Please pay attention: the numbers may change since they are randomized. Negative sign must be included if the work done is negative. Your answer must include 1 place after the decimal point, and %3D proper Sl unit. Take g = 9.81 m/s². 3 1 . 2

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