Hi guyz... im having a problem with this question. Hope to get some guideline from here :D An engine of mass m moves without driving force but under the influence of the frictional force f(v)=(alpha)+(Beta)v2 on horizontal rails. Let the initial velocity be v0. (a) After which time does the engine come to rest? What is the maximum deceleration time (v0 approaching infinity ) (b)What distance has then been covered?