12-91. The fireman holds the hose at an angle 0 = 30° with horizontal, and the water is discharged from the hose at A with a speed of va = 40ft/s. If the water stream strikes the building at B, determine his two possible distances s from the building.

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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.