= 0.02 s, 2/60 At time t = 0, the position vector of a particle mov- ing in the x-y plane is r = 5i m. By time t its position vector has become 5.1i + 0.4j m. Determine the magnitude vay of its average veloc- ity during this interval and the angle 0 made by the average velocity with 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.