A 2lb cоllаr is releаsed frоm rest аt pоint A and slides down the smooth rod. If the unstretched length of the spring is 0.8 ft and the stiffness of the spring is 2lb/ft, determine the velocity when theta equals 90 degrees (right before impact with the ground/bracket) _______ Determine the acceleration when theta equals 90 degrees (right before impact with the ground/bracket) _______ If the collar comes to rest after impact with the ground/bracket, what was the average impulsive force if the collision took place over 0.025 seconds? _______