Skater A, with unknown mass and unknown initial speed, bumps into stationary Skater B, mass 60.0 kg. After the collision, Skater A moves with speed 14.0 m/s at an angle of 36.9 from her original direction, while Skater B moves with speed 18.0 m/s at an angle of 53.1 from Skater As original direction. Both skaters move on the frictionless, horizontal surface of the rink
(a) What was the mass and initial speed of Skater A?
(b) Is kinetic energy conserved? If not, what is the change in initial kinetic energy?