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One side of spring of initial, instreach...

One side of spring of initial, instreached length `l_(0) = 1m`, lying on a frictionless table, is fixed, the other one is fastened to a small puck of mass `m = 0.1 kg`. The puck is given velocity in a direction perpendicular to the spring at an initial speed `v_(0) = 11 m//s`. In the course of the motion, the maximum elogation of the spring is `l = l_(0)//10`. What is the force constant of the spring (in `SI` units) ?
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