Three monkeys a, b, and c weighing 20, 26, and 25 lb, respectively, are climbing up and down the rope suspended from d. at the instant represented, a is descending the rope with an acceleration of 4.2 ft/sec2, and c is pulling himself up with an acceleration of 5.4 ft/sec2. monkey b is climbing up with a constant speed of 4.0 ft/sec. treat the rope and monkeys as a complete system and calculate the tension t in the rope at d.