A steel ball is thrown up with a velocity of 90 m/s from the ground. While coming down, it strikes a glass pan, held at half the height through which it has risen and loses 35% of its velocity in breaking the glass. Determine the time taken to reach the maximum height and the velocity with which it will strike the ground and total time taken to reach the ground.   Solution The time taken to reach maximum height in seconds is The maximum height reached in m is The velocity of the stone when it  hits the ground in m/s  is

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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.