A stop block, s, prevents a crate from sliding down a theta = 21.0 incline. A tensile force F=(Fo t)N acts on the crate parallel to the incline, where Fo = 295 N/s. If the coefficients of static and kinetic friction between the crate and the incline are mu_s = 0.295 and mu_k = 0.205, respectively, and the crate has a mass of 52.4 kg, how long will it take until the crate reaches a velocity of 2.49 m/s as it moves up the incline?