A piece of mass M is hung by a string of length L ‌. A ball of mass m = M / 4 has a velocity V• when it hits the piece and sinks into it. As soon as the progress of the bullet in the piece stops completely, the string tension is 2.5Mg. What is the velocity V•

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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.