A 5 lb block is sliding on a frictionless plane at a speed of 3 ft/s. If it collides with a 2 lb block, determine the speed of the 5 lb block after impact. Assume a perfectly elastic collision. Choose the answer below in feet per second.

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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.