If the fly walks away from the origin in the direction of u = i − 7j, the temperature it measures increases at a rate of 3◦C/sec. If the fly walks away from the origin in the direction v = i + j, the temperature it measures decreases at a rate of 2◦C/sec. Find how fast the temperature changes if the fly moves away from the origin in the positive x axis

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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.