According to Newton's second law, acceleration is "a = \\frac{F}{m}", where "F" is the net force, acting on an object, and "m" is the mass of the object. Frictional force "F_f" is directed in the opposite direction to the applied horizontal force "F = 60 N" , hence their net is "F - F_f = 36 N". Hence, the acceleration is "a = \\frac{ 36 N}{2.2 kg} \\approx 16.37 \\frac{m}{s^2}".
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