A billiard ball moving at 4 m/s strikes a smooth horizontal plane at an angle of 35° as shown in Fig. If the coefficient of restitution is 0.6, what is the velocity with which the ball rebounds?

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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.