2/229 In a test of vertical leaping ability, a basketball player (a) crouches just before jumping, (b) has given his mass center G a vertical velocity vo at the instant his feet leave the surface, and (c) reaches the maximum height. If the player can raise his mass center 3 feet as shown, estimate the initial velocity vo of his mass center in position (b). G VO h + 3' (a) h (b) (c)

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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.