Inelastic Collisions: Calculating Momentum

[jmaier1]

Homework Statement

Two clay balls of the same mass stick together in an completely inelastic collision. Before the collision, one travels at 5.6 m/s and the other at 7.8 m/s, and their paths of motion are perpendicular. If the mass of each ball is 0.23 kg, what is the magnitude of the momentum of the combined balls after the collision?

Homework Equations

vf= (m1vi1 + m2vi2) / m1 + m2

The Attempt at a Solution

 

[rock.freak667]

split the final momentum into x and y components