The motor pulls on the cable at A with a force F = (30 + t
Chapter 15, Problem 15-23(choose chapter or problem)
The motor pulls on the cable at A with a force F = (30 + t 2) lb, where t is in seconds. If the 34-lb crate is originally on the ground at t = 0, determine its speed in t = 4 s. Neglect the mass of the cable and pulleys. Hint: First find the time needed to begin lifting the crate.
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