A system consists of a 5.00 kg object moving down along the y-axis at a speed of 25 m/s, as well as an 8.00 kg object. The system has a net momentum of 124 kg.m/s in the direction of the + x-axis. What is the velocity of the 8.00 kg object? Express the direction of its velocity as a counterclockwise angle to the + x-axis.