The crate has a mass of 80 kg and is being towed by a chain which is always directed at 20° - 13-2

13.1 Newton’s Second Law of Motion
13.2 The Equation of Motion
13.3 Equation of Motion for a System of Particles
13.4 Equations of Motion: Rectangular Coordinates
13-2. The crate has a mass of 80 kg and is being towed by a chain which is always directed at 20° from the horizontal as shown. Determine the crate’s acceleration in t = 2 s if the coefficient of static friction is ms = 0.4, the coefficient of kinetic friction is mk = 0.3, and the towing force is P = (90t2) N, where t is in seconds.
All problems from Engineering Mechanics: Dynamics Fourteenth Edition in SI Units by R. C. Hibbeler.

[@MohmmadMaitah]

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