Physics  momentum
posted by J Velji .
Two hockey pucks approach each other as shown in the figure below. Puck 1 has an initial speed of 22 m/s, and puck 2 has an initial speed of 14 m/s. They collide and stick together.
Find the components along x and y of the initial velocities of both particles.
v1xi = 19.1 m/s
v1yi = 11 m/s
v2ix = 0 m/s
v2iy = 14 m/s
I don't understand how to..
Find the final velocity of the two pucks after the collision and angle
What fraction of the initial kinetic energy is lost in the collision

Found the final velocity and angle..
just don't understand the initial KE part now