In a game of pool, ball A moves on frictionless surface with a velocity vo = 25 m/s when it strikes balls B and C, which are %3D at rest as shown. After the collision the three balls move in the indicated directions. Assuming perfect elastic impact, Vg should be:

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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.