13-38. Block A has a mass of 20 kg and block Bhas a mass of 50 kg. If the spring is stretched 0.2 m at the instant shown, determine the acceleration of block Bat this instant if it is (a) originally at rest, (b) moving downward with a speed of 3 m/s. Neglect friction. k= 30 N/m A

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.