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On a differential equation with Caputo-Fabrizio fractional derivative of order $1<β\leq 2$ and application to mass-spring-damper system

In this work, we investigate a linear differential equation involving Caputo-Fabrizio fractional derivative of order $1<β\leq 2$. Under some assumptions the considered equation is reduced to an integer order differential equation and solutions for different cases are obtained in explicit forms. We also prove a uniqueness of a solution of an initial value problem with a nonlinear differential equation containing the Caputo-Fabrizio derivative. Application of our result to the mass-spring-damper motion is also presented.