Ball A has a mass of 2 kg, B has a mass of 4 kg. The initial speed of A is as shown, that is, 2 m/s to the right. Ball B is initially at rest. Assuming no friction and the coefficient of restitution e = 0.8, determine the final speed and direction of balls A and B. Dice: The angle between the center lines and the center of balls A and B is 30°.

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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.