2: The lecturer Aous used to drive his car early inorder to arrive and teach his students some engineering subjects in Tikrit University because he lives in Baghdad. The distance between the above two cities (Tikrit and Baghdad) is 160 km, and he always drive in average velocity which is about 75 mile per hour. Determine the time that he should start driving from Baghdad if you know that the first lecture begins at 8:30 a.m Hint: one mile is almost equal to 1.6 km

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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.