A winch, located at M, pulls box A up an incline with a cable. The distance from the box to the winch is s. Suppose that, starting from rest, the box travels the full distances with constant acceleration in T seconds. Assume the box has mass m and a sliding coefficient of friction of μk. Determine the tension in the cable, P. (Hint: Use 1D kinematics to find the acceleration.) Values: g = 9.81 m/s², 0 = 30 deg., m = 20 kg, T = 3 sec., s =6 m, k = 0.3

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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.