Joanna and her brother are skiing together while Joanna is holding the end of a rope tied to her brother. They are both moving at a velocity of 7.20kph on a sloping portion of the ski slope. Joanna notices that they are approaching a steep ski slope. She then pulls the rope with an average force of 7 Newtons. If the angle of the rope will not change and the coefficient of kinetic friction between her brother and the ground is 0.10, determine (a) the time required for her brother’s speed to be cut in half, and (b) the distance traveled in this time.

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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.