Fiona and her twin sister april are enjoying the bumper cars at an amusement park. fiona drives her car toward her sisters and the two cars collide. before the collision, fiona was moving with a speed of 3 m/s and april was moving with a speed of 1 m/s. after the collision, fiona is moving with a speed of 1 m/s and april is moving with a speed of 3 m/s. if fiona and her bumper car have a combined mass of 80 kg, what is the combined mass of april and her bumper car?
m2 = ? kg