Two cars of equal mass are traveling perpendicular to each other(one along the horizontal X axis, one along the vertical Y axis ) just before undergoing a collison. Before the collision, one of the cars has a speed of 18 m/s along the +X axis, and the other has a speed of 25 m/s along the +Y axis. The cars lock bumpers and then slide away together after the collision. What are the magnitude and direction of their final velocity?