Q5/ A car of mass 500 kg moving with velocity o 8 m/sec hit another car of mass 700 kg at rest . the two cars moves with the same velocity due to collision. a- What is the velocity of the two cars after the collision? b- How much kinetic energy is lost in the collision ?

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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.