During a pregame warmup period, two basketballs collide above the hoop when in the positions shown. Just before impact, ball 1 has a velocity v₁ which makes a 30° angle with the horizontal. If the velocity v₂ of ball 2 just before impact has the same magnitude as v₁, determine the two possible values of the angle 0, measured from the horizontal, which will cause ball 1 to go directly through the center of the basket. The coefficient of restitution is e = 0.8. Assume ball 2's position just touches the horizontal line. The line of action can be computed from the drawing on the right. 2 1 10₁ 30° 15 2 V₁ XT200

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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.