The 80lb plank shown in figure, rests on two cylindrical rollers with radius r each weighing 30lbs. Calculate the force P that will accelerate the plank up the incline at 6ft/s². Assume no slipping occurs either at the plank or at the incline.

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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.