A yacht is being tracked along a straight path using a radar. At the instant shown, the yacht is d = 281 m north of the radar, and r = 444 m away from the radar, moving eastwards at 5.9 m/s as shown in the diagram below. Calculate how fast the distance between the yacht and the radar is increasing. Express your answer in units of m/s to two significant figures, but do not include the units in your answer. Radar Tracking Station W N E

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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.