A train is initially traveling along a straight track at a speed of 100 km/h. For 6 s it is subjected to a constant deceleration of 0.5 m/s², and then for the next 9 s it has a constant deceleration ▾ Part A Determine a, so that the train stops at the end of the 15-s time period. Express your answer to three significant figures and include the appropriate units. -7.333 Submit PA 3 m CB ? Previous Answers Request Answer

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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.