A train enters a curved horizontal section of track at a speed of 132 km/h and slows down with constant deceleration to 40 km/h in 16 seconds. An accelerometer mounted inside the train records a horizontal acceleration of 2.6 m/s? when the train is 6.1 seconds into the curve. Calculate the radius of curvature p of the track for this instant. Answer:p = i m

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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.