A block of ice of mass m slides down an incline that makes an angle θ = 28.6o with the horizontal. In trial 1 there is no friction; the block starts at rest and takes time t to reach the bottom of the incline. In trial 2 there is friction, and the the block slides down the incline in time 3.59t. Find μk, the coefficient of kinetic friction between the ice and the incline in trial 2.