The 0.8-kg particle is attached to the system of two light rigid bars, all of which move in a vertical plane. The spring is compressed an amountb/2 when theta = 0, and the length b = 0.30 m. The system is released from rest in a position slightly above that for theta = 0. (a) If the maximum value of e is observed to be 50°, determine the spring con-stant k. (b) For k400 N/m, determine the speedv of the particle when theta = 25°. Also find the corre-sponding value of é.