Prob. 15.238 The arm AB of length 5 m is used to provide an elevated platform 1009 for construction workers. In the position shown, arm AB is being raised at the constant rate du/dt = 0.25 rad/s; simultaneously, the unit is being rotated about the Y axis at the constant rate ω1 5=0.15 rad/s. Knowing that θ = 20°, determine the velocity and acceleration of point B.
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