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The arm AB of length 16 ft is used to provide an elevated platform for construction workers. In the position shown, arm AB is being raised at the constant rate dθ/dt = 0.25 rad/s; simultaneously, the unit is being rotated about the Y axis at the constant rate ω1 = 0.15 rad/s. Knowing that θ = 20°, determine the velocity and acceleration of point B.
Fig. P15.236
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