moving in the positive x-direction, with A behind B initially. Particle A has speed 20 m/S and mass 1 g whilst B has speed 12 m/s and mass 3 g. At some time later the particles coalesce. If momentum is conserved, what is the loss

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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.