Problem

A bullet B weighing 147 gr (1 lb = 7000 gr) is fired with a speed υ0 as shown and becomes...

A bullet B weighing 147 gr (1 lb = 7000 gr) is fired with a speed υ0 as shown and becomes embedded in the center of a rubber block of dimensions h = 4.5 in. and w = 6 in. weighing Wrb = 2 lb. The rubber block is attached to the end of a uniform thin rod A of length L = 1.5 ft, weight Wr = 5 lb, and that is pinned at O. After the impact, the rod (with the block and the bullet embedded in it) swings upward to an angle of 60°. Determine the speed of the bullet right before impact.