The crate has a mass of 80 kg and is being towed by a chain which is always directed at 20 degrees from the horizontal as shown. Determine the crate's acceleration in t=2s if the coefficient of static friction is As = 0.4, the coefficient of kinetic friction is 0.3 ', and the towing force is P = (90t²)N, where T is in seconds. 20°

The crate has a mass of 80 kg and is being towed by a chain which is always directed at 20 degrees from the horizontal as shown. Determine the crate's acceleration in t=2s if the coefficient of static friction is As = 0.4, the coefficient of kinetic friction is 0.3 ', and the towing force is P = (90t²)N, where T is in seconds. 20°