• A metallic ball with mass M=1 kg and density d=10 kg/L is in water. The density of water is w=1 kg/L. The ball is hanging from the ceiling above the water container with a spring with spring constant k=1 N/m.
• a) If the ball is stationary, what should be the elongation of spring from its unstarched position?
• b) If the ball is moved upward to the position where the spring is unstarched and then let go to start moving downward with zero initial velocity, what will be the maximum elongation that the spring?