A cart, which is moving at a speed of 20 m / s, starts to suffer a force resulting from intensity 60 N, in the same direction and in the opposite direction to the speed. Knowing that F = ma, Where F is force, m is mass and a is acceleration. It appears that, after a time interval of 5.0 s, the speed is 5.0 m / s. The mass of the cart, in kg, is: Choose one: The. 50 B. 20 ç. 30 d. 10 e. 40

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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.