A box of mass 25.0 kg is connected to another box of mass 15.0 kg by an inextensible string of negligible mass. The string is passed over a frictionless pulley of mass 8.0 kg and radius 30.0 cm. The pulley is a solid disk that is free to rotate about the horizontal axis passing through its centre. Initially, the 25.0 kg mass is 5.00 m above the floor, and the masses are at rest. If the masses are released, what is the time it takes for the 25.0 kg mass to hit the floor?

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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.