A mass is lying on a flat surface where the coefficient of friction between the surface and the mass is $\mu$. The mass is connected to a spring that produces a force equal to -kx, where k is the spring constant and x is the displacement from the equilibrium position. The equation of motion of the mass when it is displaced a distance x₀ is: A) $m \ddot { x } = - k x - \mu m g$ B) $m \ddot { x } = + k x + \mu m g$ C) $m \ddot { x } = k x - \mu m g$ D) $m \ddot { x } = - k x + \mu m g$

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The Answer of A mass is lying on a flat surface where the coefficient of friction between the surface and the mass is $\mu$. The mass is connected to a spring that produces a force equal to -kx, where k is the spring constant and x is the displacement from the equilibrium position. The equation of motion of the mass when it is displaced a distance x₀ is: A) $m \ddot { x } = - k x - \mu m g$ B) $m \ddot { x } = + k x + \mu m g$ C) $m \ddot { x } = k x - \mu m g$ D) $m \ddot { x } = - k x + \mu m g$

A Mass Is Lying on a Flat Surface Where the Coefficient