A stone is falling vertically downward from a tall building of height 120m. (a) How much time it will take to reach half the height of the building? (b) How long does it take to reach its bottom? (c) What is the velocity of the stone after 3 s? (d) What is its velocity when it touches before the ground? (d) What is its velocity when it touches the ground? Velocity of the stone when it touches the ground =

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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.