The ball of mass M of negligible size is fired up the vertical circular track using the spring plunger. The plunger keeps the spring compressed a distance k when x = 0. Determine how far x it must be pulled back and released so that the ball will begin to leave the track when theta = theta1. Given: M = 0.8 kg , k = 0.08m, theta1 = 135 deg , r = 1.5m , k = 500 N/m , g = 9.81m/s2.