The log has a mass of 500 kg and rests on the ground for which the coefficients of static and kinetic friction are μs = 0.5 and μk = 0.4 respectively. The winch delivers a horizontal towing force T to its cable at A which varies as shown in the graph. Determine the speed of the log when t = 5 s. originally the tension in the cable is zero. Hint: first determine the force needed to begin moving the log. |

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