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Question : A 3 kg collar is constrained to travel in the horizontal pla...

A 3 kg collar is constrained to travel in the horizontal plane along a frictionless ring of radius R = 0.75 m. The spring attached to the collar has a spring constant k = 21N/m. Treating the collar as a particle, neglecting air resistance, and knowing that at A the collar is at rest, determine the spring’s unstretched length if the collar is to reach point B with a speed of 2m/s.

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