Can you please explain the solution given at the second picture. where does 1000 comes from A 0.02 kg ball is horizontally flying at 120 mps. It is struck by a force at 400 as shown. The impulse graph is given. What is the final velocity of the ball?

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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.