13-2. The crate has a mass of 80 kg and is being towed bya chain which is always directed at 20° from the horizontal's shown. Determine the crate's acceleration in t = 2 s if the coefficient of static friction is μ, = 0.4, the coefficient of kinetic friction is k = 0.3, and the towing force isP = (9012) N, where t is in seconds.