A car A is travelling along a straight path, while a lorry B is travelling along a circular path having a radius of curvature of 200 m as shown in Figure Q3. At the instant shown, car A travel at the velocity of (150+2) km/h while lorry B travel at the velocity of 80 km/h. Also at this instant, car A has an increase velocity of 7000 km/h2 and lorry B has a decrease velocity of 4500 km/h2. The angle between straight path of car A and the horizontal line is θ=65°. Calculate the magnitude and direction of velocity of lorry B with respect to car A. Determine the magnitude and direction of acceleration of lorry B as measured by the driver of car A.

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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.