A 75 lb crate is initially at rest when a force P = 40 lb is applied to the pulley system...

A 75 lb crate is initially at rest when a force P = 40 lb is applied to the pulley system as shown. Use the impulse-momentum principle to determine the speed of the crate after 2 s. Neglect the inertia of the rope and of the pulleys, and assume that all the cable segments are purely vertical.

Figure P5.16