2. When s 0, the spring on the firing mechanism is unstretched. If the arm is pulled back such that s 100 mm and released, determine the speed of the 0.3-kg ball and the normal reaction N of the circular track on the ball when = 60°. Assume all surfaces of contract to be smooth. Neglect the mass of the spring and the size of the ball. Answers: m/s, N= Newtons. ALLO k = 1500 N/m 1.5 m