(Solved): Please use Matlab when you solve this problem  A 6-kg collar is attache ...

Please use Matlab when you solve this problem 

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A 6-kg collar is attached to a spring anchored at point \( C \) and can slide on a frictionless rod forming an angle of \( 30^{\circ} \) with the vertical. The spring is of constant \( k \) and is unstretched when the collar is at \( A \). Knowing that the collar is released from rest at \( A \), use computational software to calculate and plot the speed of the collar at point \( B \) for values of \( k \) from 20 to 400 \( \mathrm{N} / \mathrm{m} \).