F13-5. The spring has a stiffness k = 200 N/m and is unstretched when the 25-kg block is at A. Determine the acceleration of the block when s = 0.4 m. The contact surface between the block and the plane is smooth. تحرك من من Lo 0.3 m A 0.5 0.4 L1 إلى هنا F= 100 N F = 100 N k=200 N/m .3 F13-5 mil of Price