An object of mass 4m is initially at rest. It breaks into three parts, two of mass m and one of mass 2m. After the explosion, one of the objects of mass m moves along the -y-axis with a speed of 10 m/s and the other one of mass m moves along the positive x-axis. Find the magnitude and the direction of the velocity of 2m after the explosion.

An object of mass 4m is initially at rest. It breaks into three parts, two of mass m and one of mass 2m. After the explosion, one of the objects of mass m moves along the -y-axis with a speed of 10 m/s and the other one of mass m moves along the positive x-axis. Find the magnitude and the direction of the velocity of 2m after the explosion.