13. If we use plus and minus signs to indicate the directions of velocity and acceleration, then the object speed up, when.. * positive velocity and negative acceleration positive velocity and zero acceleration negative velocity and negative acceleration

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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.