A 2-m long concrete traffic barrier is used to provide safety for workers, pedestrians, and motorists during highway construction. The concrete has 0.024 N/cm³ specific weight. The interface between the barrier and pavement has static and kinetic coefficients of friction of 0.45 and 0.4, respectively, and h = 45 cm. Determine the force P that will cause motion of the barrier.

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Friction

Friction is defined as the force that prevents any solid surface, any layer of fluid, or any kind of element or material from sliding.