= 0 and The man pulls. the boy up to the tree limb C by walking backward. If he starts from rest when XA moves backward with a constant acceleration a = 0.2 m/s², determine the speed of the boy at the instant YB = 4 m. Neglect the size of the limb. When XA = 0, YB = 8 m, so that A and B are coincident, i.e., the rope is 16 m long. Ув 11o bris Asbold n -XA C B Ув 8m Ans. VB = 1.41 m/s ↑

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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.