On a differential equation with Caputo-Fabrizio fractional derivative of   order $1<\beta\leq 2$ and application to mass-spring-damper system
  In this work, we investigate a linear differential equation involving Caputo-Fabrizio fractional derivative of order $1<\beta\leq 2$. 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. 
Nasser Al-Salti, Erkinjon Karimov and Kishin Sadarangani
math.AP