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End A of the 6-kg uniform rod AB rests on the inclined surface, while end B is attached to a collar of negligible mass that can slide along the vertical rod shown. When the rod is at rest, a vertical force P is applied at B, causing end B of the rod to start moving upward with an acceleration of 4 m/s2. Knowing that θ = 35°, determine the force P.
Fig. P16.121 and P16.122
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