The crates A and B of weight WA = 50 lb and WB = 75 lb, respectively, are connected by a p...

The crates A and B of weight WA = 50 lb and WB = 75 lb, respectively, are connected by a pulley system. The system is released from rest and friction between A and the horizontal surface is insufficient to prevent slipping. The cables in the pulley system are inextensible, and the coefficient of kinetic friction between the crate A and the horizontal surface is μk.

If μk = 0, determine the speed of B after A slides 10 ft.

Figure P4.78