6. A water jet of cross-sectional area A with a velocity U, and density p causes a cart to move at a constant velocity U=U₁. What is the rolling resistance of the cart?

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A: Solution:

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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.