The vertical motion of the 50-lb block is controlled by the two forces P applied to the ends A and B of the linkage, where A and B are constrained to move in the horizontal guide. If forces P = 250 lb are applied with the linkage initially at rest with θ = 60°, determine the upward velocity v of the block as θ approaches 180°. Neglect friction and the weight of the links and note that P is greater than its equilibrium value of (5W/12) cot 30° = 217 lb.

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W = 50 lb b 9. b b = 10" b b P A В