A model airplane flies over an observer O with constant speed in a straight line as shown. Determine the signs (positive [p], negative [n], or zero [z]) for r,r˙,r¨,θ,θ˙, and θ¨ for each of the positions A, B, and C.

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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.