A particle (particle 1) is traveling along the positive x-ax…

A particle (particle 1) is traveling along the positive x-axis with a constant speed of 50.0 m/s. It collides head-on with an identical particle moving towards it with a speed of 39.0 m/s. If both masses are 1.0 kg, what is the final speed of the first particle just after the collision? Two significant digits.